Get Practical tips -> Checking and refilling levels Guide for Seat Leon 4 Door Third Generation (2012-2020)

Practical tips

●

The aerial is installed on the exterior of the

driver's immediate control of the vehicle and

that any such equipment carries the  mark.

Any retrofit equipment that could influence

the driver's control of the vehicle must have a

type approval for your vehicle and must carry

the e mark.

Checking and refilling lev-

els

vehicle (and shielded cables are used to-

gether with non-reflective aerial trimming).

●

The effective transmitting power does not

exceed 10 Watts at the aerial base.

Filling the tank

A SEAT Official Service and specialised work-

shop will be able to inform you about options

for installing and operating radio transmitters

with a higher transmitting power.

WARNING

Refuelling

Mobile telephones or radio equipment

which is operated inside the vehicle without

a properly installed external aerial can

create excessive magnetic fields that

could cause a health hazard.

Read the additional information carefully

^››› ^{page 47}

Mobile radio transmitters

If the automatic filler nozzle is operated cor-

rectly, it will switch itself off as soon as the

fuel tank is “full”. Do not try to put in more fuel

after the nozzle cuts out, as this will fill the ex-

pansion chamber in the fuel tank.

Commercial mobile telephones or radio

equipment might interfere with the electron-

ics of your vehicle and cause malfunctions.

This may be due to:

Note

●

The posterior fitting of electric and elec-

tronic equipment in this vehicle affects its

licence and could lead to the withdrawal of

the vehicle registration document under

certain circumstances.

The correct fuel grade for your vehicle is giv-

en on a sticker on the inside of the fuel tank

flap. Further notes on fuel can be found at

●

No external aerial.

External aerial incorrectly installed.

Transmitting power more than 10 W.

●

page 317.

›››

●

Please use the mobile telephone/radio

The capacity of your vehicle's fuel tank is giv-

You must, therefore, do not operate portable

mobile telephones or radio equipment inside

the vehicle without a properly installed exter-

operating instructions.

en in

^››› ^{page 47.}

Vehicles with natural gas engines and hy-

brids

nal aerial

.

›››

Please note also that the maximum range of

the equipment can only be achieved with an

external aerial.

Every 6 months it is necessary to run on pet-

rol until the control lamp switches off  and

then the tank must be refilled. This is neces-

sary to ensure that the system works proper-

ly, as well as the fuel quality required for driv-

ing with petrol.

Business equipment

Retrofit installation of business or private

equipment in the vehicle is permitted, provi-

ded the equipment cannot interfere with the

314

Checking and refilling levels

WARNING

–

Never spill fuel in the vehicle or in the

luggage compartment. Fuel vapour is

explosive. Risk of fatal accident!

essary, request assistance from special-

ised personnel.

Fuel is highly flammable and can cause se-

rious burns and other injuries.

Note

●

Do not smoke when filling the fuel tank or

CAUTION

If any fuel is spilt onto the vehicle, it

should be removed immediately. It could

otherwise damage the paintwork.

a canister. Naked flames are forbidden in

the vicinity due to the risk of explosion.

Diesel vehicles are fitted with a protective

device that prevents the insertion of the

wrong fuel hose¹⁾. It is only possible to re-

fuel with Diesel nozzles.

●

Observe legislation governing the use,

storage and carrying of a spare fuel canis-

ter in the vehicle.

●

Never run the tank completely dry. An ir-

If the pump nozzle is worn, damaged, or if

regular fuel supply could cause misfiring.

As a result, unburnt fuel could enter the ex-

haust system and damage the catalytic

converter.

it is very small, it is possible that it will not

be able to open the protective device. Be-

fore trying to insert the pump nozzle by

turning it, try a different pump or request

specialist help.

●

For safety reasons we do not recommend

carrying a spare fuel canister in the vehi-

cle. In an accident the canister could be

damaged and could leak.

●

When filling the fuel tank after having run

●

If, in exceptional circumstances, you

●

it completely dry on a vehicle with a diesel

engine, the ignition must be switched on for

at least 30 seconds before starting the en-

gine. When you then start the engine it may

take longer than normal (up to one minute)

to start firing. This is because air needs to

be bled from the fuel system while starting.

If you fill the tank from a reserve fuel can-

have to carry a spare fuel canister, please

observe the following points:

ister, the protective device will not open.

One way to resolve this is to pour the fuel in

very slowly.

–

Never fill fuel into the spare fuel canis-

ter if it is inside or on top of the vehicle.

An electrostatic charge could build up

during filling, causing the fuel vapour to

ignite. Danger of explosion. Always

place the canister on the ground to fill

it.

For the sake of the environment

Do not overfill the fuel tank, it may cause

the fuel to overflow if it becomes warm.

–

Insert the filling nozzle as far as possi-

ble into the spare fuel canister.

–

If the spare fuel canister is made of

metal, the filling nozzle must be in con-

tact with the canister during filling. This

helps prevent an electrostatic charge

building up.

Note

There is no emergency mechanism for the

manual release of the fuel tank flap. If nec-

1)

Depending on country

315

Practical tips

●

Press on the rear area of the flap and open

Refuelling with natural gas

●

Before refuelling with natural gas, en-

it.

gage the filling mouth correctly. If you can

smell gas, stop refuelling immediately.

Refuelling

Special feature: If the ambient temperature

is very high, the natural gas pump protection

against overheating disconnects this auto-

matically.

WARNING

The vehicle is not prepared to use liquefied

natural gas (LNG), and this fuel must not be

added under any circumstances. Liquefied

natural gas can cause the natural gas tank

to explode, resulting in serious injury.

●

Remove the plug from the gas filler mouth

1

Fig. 305

.

›››

●

Connect the pump filling nozzle to the gas

filler mouth.

Note

1

Fig. 305 Open tank lid: gas filler mouth

,

2

filler mouth retainer

●

The filling nozzles of natural gas pumps

●

The fuel tank will be full when the pump

can differ in the way they are operated. If

you do not know, ask a qualified employee

at the petrol station to do the refuelling.

compressor automatically cuts the supply.

Before refuelling, the engine and the ignition,

●

If you wish to finish refuelling in advance,

mobile telephone and heating must be

press the button on the pump to stop the flow.

switched off separately

.

›››

●

Noises heard when refuelling are normal

and do not indicate the presence of a fault

in the system.

Read the instructions on how to use the natu-

ral gas pump carefully.

Closing the fuel tank cap

●

2

Check that the mouth retainer

of the gas

●

The vehicle natural gas system is pre-

The vehicle is not prepared for refuelling with

filler is not trapped with the filler. If necessary,

place it in the filler mouth again.

pared both for refuelling with a small com-

pressor (slow refuel) and a large compres-

sor (fast refuel) in natural gas service sta-

tions.

liquefied natural gas (LNG)

. Before refu-

›››

elling with natural gas, make sure you add

●

Insert the plug in the filler mouth.

the appropriate type of fuel page 319.

›››

●

Close the tank flap. Make sure you hear it

click into place.

Opening the fuel tank cap

The natural gas filler mouth is behind the fuel

tank cap, next to the petrol filler mouth.

WARNING

Natural gas is a highly explosive, easily

flammable substance. Incorrect handling

of the natural gas can cause accidents se-

rious burns and other injuries.

●

Unlock the vehicle with the key or with the

central locking button  situated on the driv-

er door page 127.

›››

316

Checking and refilling levels

centage of biodiesel in the diesel. “B7”

means, for example, a proportion of bio-

diesel of max. 7%.

Natural gas: “CNG” means Compressed

Natural Gas.

Super unleaded petrol 95 octane petrol or

normal 91 octane petrol at least

Fuel

Identification of the fuel¹⁾

We recommend refuelling with super 95 oc-

tane petrol (91 AKI). If not available: normal 91

octane petrol (87 AKI) (with a slight power

loss).

3

Super unleaded petrol, 95 octanes at

least

Type of petrol

3 Applies to vehicles: with petrol engine

You should use super 95 octane petrol (91

AKI) at least.

The correct grade of petrol is listed inside the

fuel tank flap.

If super is not available, if necessary, use nor-

mal 91 octane petrol (87 AKI). In this case only

use moderate engine speeds and a light

throttle. Refuel with super as soon as possi-

ble.

The vehicle is equipped with a catalytic con-

verter and must only be run on unleaded

petrol. The petrol must comply with the

standard EN 228 and be sulphur-free. Fuels

with a 10% ethanol ratio can be refuelled

(E10)²⁾. The types of petrol are differentiated

by using the octane numbers (RON) or via

the anti-knock index (AKI).

Fig. 306 Identification of fuels according to

European Union (EU) Directive 2014/94/

Fuels are identified with different symbols.

Depending on the fuel, the different symbols

are on the pump and the tank lid of your vehi-

cle. The identification serves to prevent con-

fusion when choosing the fuel.

Unleaded super plus 98 octane petrol or

super 95 octane petrol at least

We recommend refuelling with super plus 98

octane petrol (93 AKI). If not available: super

95 octane petrol (91 AKI) (with a slight power

loss).

The following pieces of text show the infor-

mation included in the corresponding stickers

on the tank lid (examples):

1

Petrol with ethanol (“E” stands for Etha-

nol). The number indicates the percent-

age of ethanol in the petrol. “E5” means,

for example, an ethanol ratio of 5% max.

If super is not available, if necessary, use nor-

mal 91 octane petrol (87 AKI). In this case only

use moderate engine speeds and a light

»

2

Diesel with biodiesel (“B” stands for Bio-

diesel). The number indicates the per-

1)

Depending on country

Follow the regulations of the country you are

2)

driving in.

317

Practical tips

throttle. Refuel with super as soon as possi-

ble.

Diesel

Note

3 Applies to vehicles: with diesel engine

●

Fuel with an octane rating higher than the

one required by the engine can be used.

CAUTION

Please note the information on the inside of

the fuel tank flap.

●

In countries in which there is no sulphur-

free fuel, it is also allowed to use low sul-

phur content fuel.

●

Fuels high percentage of ethanol, e.g.

E30 - E100 button must not be used. The

fuel system would be damaged. Exception:

We recommend you use Diesel according to

standard EN 590.

vehicles with Totalflex engine page 318,

›››

Ethanol fuel.

The diesel can thicken at very low tempera-

tures, thus affecting the start or operation of

the engine. To ensure that you can continue

to use your vehicle as usual, the diesel sold in

gas stations is provided -depending on the

station- with fluidity when cold. Ask the em-

ployee of the petrol station whether their die-

sel is suitable for use in winter and if it is suited

for current and future temperatures.

Ethanol fuel

3 Applies to vehicles: with Totalflex engine

●

A single refuelling with leaded fuel or

other metal additives entails a permanent

deterioration of the effectiveness of the

catalytic converter.

You can recognise vehicles with Totalflex en-

gines¹⁾by label on the fuel tank lid with with

the marking “Petrol/ethanol”.

●

Only use fuel additives that have been

approved by SEAT. The products that con-

tain substances to increase the octane rat-

ing or decrease knocking may contain met-

al additives that damage the engine and

catalytic converter. This type of products

must not be used.

Vehicles with Totalflex engine can run with

unleaded petrol (95 octane / 91 AKI) accord-

ing to ANP No. 57 and with fuels with any high

percentage of ethanol. The vehicle is refuel-

led in the same way as petrol refuelling.

Water in the fuel filter²⁾

If your vehicle has a diesel engine and is

equipped with a fuel filter with a water sep-

arator, the instrument panel may display the

following warning:

●

Do not use fuels shown in the pump as

Also consider that page 317, Type of pet-

›››

containing metals. LRP (lead replacement

petrol) fuels contain high concentrations of

metal additives. Risk of engine damage!

rol

Note

●

Water in the fuel filter.

High engine speed and full throttle can



damage the engine when using petrol with

an octane rating lower than the correct

grade for the engine.

SEAT recommends filling the tank exclu-

sively with petrol every 10,000 km to de-

crease impurities that using E100 ethanol

fuel might have left in the engine.

If this is the case, take the vehicle to a speci-

alised workshop so that they can drain the

fuel filter.

1)

This motor is only available in some markets.

Depending upon country.

2)

318

Checking and refilling levels

●

Natural gas quality and consumption

Extinguish cigarettes immediately.

Move away from the vehicle or switch off

CAUTION

Never use of FAME (biodiesel), petrol,

heating oil, other fuels or thinning agents

as they can cause severely damage the

fuel system and the engine.

Natural gas is divided into the groups H and L

depending on its quality.

●

objects that may cause sparks or a fire.

●

If you continue to smell gas, do not contin-

ue driving!

Gas type H has a superior heating power and

inferior nitrogen and carbon dioxide content

than type L. The higher the heating power of

the natural gas, the lower the consumption

will be.

●

If the wrong fuel has been filled, do not

●

Seek specialist assistance. Have the fault

start the engine under any circumstances.

Risk of damaging the fuel system and the

engine! Obtain technical assistance.

repaired.

Regular checks of the natural gas system

However, the heating power and the propor-

tion of nitrogen and carbon dioxide can fluc-

tuate within the quality groups. Therefore, ve-

hicle consumption can also vary when using

a single type of gas only.

The natural gas tanks may be damaged or

corroded by external factors. The walls of the

gas tanks are weakened by deformations,

damage or corrosion. As a result, the tanks

could burst and result in serious injuries or

even death. For this reason, the vehicle owner

must have a specialised workshop check (vis-

ual check) the gas system every 4 years at

least. The vehicle owner must have a speci-

alised workshop replace the natural gas

tanks before they reach the end of their serv-

ice life. For further information about the serv-

ice life of gas tanks, go to a SEAT dealer serv-

ice or a specialised workshop

Natural gas

3 Applies to vehicles: with a natural gas engine

The engine management automatically

adapts to the natural gas used according to

its quality. Therefore, different quality gases

can be mixed in the tank, without the need for

comprehensive draining before applying a

different quality gas.

Natural gas can be compressed or in liquid

form, addition to others.

Use of compressed natural gas (CNG)

Vehicles with a natural gas engine must only

be working with CNG (Compressed Natural

Gas CNG ), or with a mixture of biomethane

if it complies with Regulation EN 16723-2.

Updated information relating to natural gas

quality is displayed on the instrument panel

page 108.

›››

Do not use fuels such as liquefied natural gas

(Liquefied Natural Gas), liquified petroleum

gas (LPG = Liquefied Petroleum G) or hy-

WARNING

Natural gas and safety

If you can smell gas or suspect that there is a

Failure to act when you can smell gas in the

vehicle or when refuelling can cause seri-

ous injuries.

thane (hydrogen mixed with methane)

.

›››

leak

:

›››

Therefore, vehicles with a natural gas engine

must only be refuelled using compressed

natural gas (CNG).

●

Stop the vehicle immediately.

Switch the ignition off.

Open the doors to appropriately ventilate

●

Carry out the necessary operations.

●

Leave the danger zone.

●

If necessary, warn the emergency serv-

the vehicle.

»

ices.

319

Practical tips

page 320. If this information is ignored,

›››

WARNING

Note

later on it will not be possible to re-start the

engine. If this warning does not appear, it is

not necessary to refill the AdBlue^®tank.

The vehicle is not suitable for liquefied nat-

ural gas (LNG) or liquefied petrol gas (LPG),

so LNG or LPG should not be used under

any circumstances. Liquid gas can cause

an explosion of the natural gas tanks and

cause severe injuries!

Have the natural gas system checked regu-

larly by a specialised workshop, according

to the Maintenance Programme.

AdBlue^®is a registered brand of the German

Association of the Automotive Industry (VDA)

and is also known as AUS32 or DEF (Diesel

Exhaust Fluid).

AdBlue^®

Information on AdBlue^®

WARNING

CAUTION

Filling the AdBlue^®tank excessively can

cause damage to the tank.

Damaged, corroded or rusted tanks can re-

sult in serious injury or even death.

●

Have the natural gas deposits checked at

least every 4 years (visual check).

●

Natural gas tanks have a limited service

Refilling AdBlue^®

life. Have the natural gas tanks replaced

when required. You can obtain further infor-

mation about this at SEAT dealers or speci-

alised workshops.

Fig. 307 Related video

The consumption of AdBlue^®depends on

your personal driving style, the temperature

of the system and on the outdoor tempera-

ture when the vehicle is used.

AdBlue^®freezes at temperatures of -11°C

(+13°F). The system has heating elements

that guarantee its operation even at low tem-

peratures.

The AdBlue^®tank level capacity is approxi-

mately 11 litres.

The AdBlue^®tank should never be empty.

When the distance to empty drops below

2400 km, a warning to refill the AdBlue^®tank

will appear on the dash panel display

WARNING

If the vehicle underbody touches the

ground or in the event of a rear collision,

there could be damage to the natural gas

tanks.

●

Check whether there is a smell of gas.

●

If you notice a smell of gas, take the vehi-

Fig. 308 AdBlue tank cap.

cle to a specialised workshop immediately

and have the natural gas system checked.

Operations prior to refilling

Park the vehicle on a flat surface. If the vehi-

cle is not parked on a flat surface, but, for ex-

ample, on a slope or on the side of a curb, the

320

Checking and refilling levels

●

level indicator may not detect the load prop-

erly.

Wait until the contents of the refill bottle

WARNING

have been poured into the AdBlue^®tank. Do

not compress or break the bottle!

AdBlue^®should only be stored in the origi-

nal container, which should be tightly

closed and kept in a safe place.

If a warning message about AdBlue^®levels

appears on the dash panel display, fill at

least the minimum amount required (ap-

prox. 5 litres) Only after adding this amount

will the system detect that AdBlue^®has been

added and you will be able to start the en-

gine again. The maximum amount that can

be refilled is 11 litres.

●

Turn the bottle in a counter-clockwise di-

rection and gently pull it upwards

.

›››

Never keep AdBlue^®in empty food con-

tainers, bottles or other similar containers.

Other people may confuse it for other

products.

Keep AdBlue^®out of the reach of chil-

dren.

●

The AdBlue^®tank is full when no more liquid

comes out of the bottle.

●

Screw on the tank cap in a clockwise direc-

●

tion until it is tightly closed.

●

Close the fuel tank flap.

Switch the ignition off. If the ignition is not

switched off during refilling, the warning to re-

fill may continue to appear on the instrument

panel display.

CAUTION

Operations before driving

●

When refilling, the nozzle grip should be

aligned downward. Otherwise the nozzle

will not connect automatically.

After refilling the tank, only switch on the ig-

nition.

●

Leave the ignition on for at least 30 sec-

Fill with a refill bottle

Only use AdBlue^®that complies with ISO

22241-1. Only use original containers.

●

Do not try to add any more additive after

onds for the system to detect the fluid load.

●

the nozzle has stopped for the first time.

The AdBlue tank could overflow and AdBlue

could spill out.

Make sure you wait for at least 30 seconds

before starting the engine!

●

Open the tank cover Fig. 308.

Unscrew the tank cap by turning it in an an-

›››

Only use AdBlue^®that complies with ISO

22241-1. Only use original containers.

Never mix AdBlue^®with water, fuel or ad-

ditives. Any type of damage caused by

such a mixture will not be covered by the

warranty.

●

Refilling the dispenser with AdBlue

●

ti-clockwise direction.

Valid for vehicles with selective catalytic re-

duction.

●

Please observe the manufacturer's instruc-

tions, indicated on the refill bottle.

●

Open the tank cap.

Turn the SCR tank cap anti-clockwise

Fig. 308.

●

Check the expiry date.

●

Never pour AdBlue^®into the fuel tank.

This could result in engine damage.

●

Remove the cap of the refill bottle.

›››

●

Insert the neck of the bottle in the tank filler

●

Add AdBlue until the nozzle stops for the

first time.

●

Do not carry the refill bottle inside the

neck vertically and screw the bottle on by

hand, by turning it in a clockwise direction.

vehicle. If there is a leak (due to tempera-

ture changes or damage to the bottle), the

AdBlue^®may damage the vehicle.

●

Close the SCR tube by turning it clockwise

●

Press the refill bottle in the direction of the

»

until you hear a click.

filler neck and hold it in this position.

321

Practical tips

●

For the sake of the environment

Dispose of the refill bottle in an environ-

ment-friendly manner.

gearbox, place the selector lever in posi-

tion P. Wait for the engine to cool down.

Observe the following additional warn-

ings if work on the fuel system or the elec-

trical system is necessary:

●

Keep children away from the engine

–

compartment.

Always disconnect the battery from the

on-board network.

●

Never spill liquids used for vehicle opera-

Note

–

tion on the engine compartment, as these

may catch fire (e.g. the antifreeze in cool-

ant).

Do not smoke.

You can buy refill bottles that are adequate

–

Never work near naked flames.

for AdBlue^®use at SEAT dealerships.

–

Always keep an approved fire extin-

guisher immediately available.

●

Take care not to cause short circuits in

the electrical system, especially when

working on the battery.

Engine compartment

CAUTION

●

If working inside the engine compart-

When topping up fluids make sure the cor-

rect fluid is put into the correct filler open-

ing, otherwise this can cause serious mal-

functions or engine damage.

ment, remember that, even when the igni-

tion is switched off, the radiator fan may

start up automatically, and therefore there

is a risk of injury.

Working in the engine compart-

ment

Read the additional information carefully

^››› ^{page 18}

●

Never cover the engine with additional in-

sulating materials such as a blanket. Risk of

fire!

For the sake of the environment

Always be aware of the danger of injury

and scalding as well as the risk of acci-

dent or fire when working in the engine

compartment (e.g. when checking and re-

filling fluids). Always observe the warnings

listed below and follow all general safety

precautions. The engine compartment of

the vehicle is a potentially hazardous area

Inspect the ground underneath your vehi-

cle regularly so that any leaks are detec-

ted at an early stage. If you find spots of oil

or other fluids in the area where it was

parked, have your vehicle inspected at the

workshop.

●

Do not unscrew the cap on the coolant

expansion tank when the engine is hot. The

cooling system is under pressure.

●

Protect face, hands and arms by cover-

ing the cap with a large, thick rag to protect

against escaping coolant and steam.

●

If it is necessary to work in the engine

Note

.

›››

compartment while the engine is running,

the rotating components (for example,

poly-V belt, alternator, radiator fan) and

the high voltage ignition system are an ad-

ditional hazard.

In right-hand drive vehicles* some brake

fluid reservoirs are on the other side of the

WARNING

engine compartment Fig. 309.

›››

●

Switch the engine off, remove the key

from the ignition and apply the hand brake.

If the vehicle has a manual gearbox, place

the lever in neutral; if it has an automatic

322

Checking and refilling levels

Opening and closing the bonnet

Read the additional information carefully

^››› ^{page 18}

WARNING

●

Never open the bonnet if you see steam

or drips of coolant being released from the

engine compartment. Failure to comply

could result in burns. Wait until no steam or

coolant can be seen before opening the

bonnet.

●

For safety reasons the bonnet must al-

ways be completely closed when the vehi-

cle is moving. Therefore, after closing the

bonnet, always check that the locking ele-

ment is properly engaged. This is the case

if the bonnet is flush with the adjacent

body panels.

●

Should you notice that the bonnet is not

safely secured when the vehicle is moving,

stop the vehicle immediately and close the

bonnet. Failure to follow this instruction

could result in an accident.

CAUTION

To avoid damage to the bonnet and to the

windscreen wiper arms, only open it when

the windscreen wipers are in place against

the windscreen.

323

Practical tips

Checking levels

Fig. 309 Diagram for the location of the various el-

ements.

From time to time, the levels of the different

fluids in the vehicle must be checked. Never

fill with incorrect fluids, otherwise serious

damage to the engine may be caused.

above. These operations are described in

Because the use of high-quality oil is essen-

tial for the correct operation of the engine

and its long useful life, when topping up or

changing oil, use only those oils that comply

with VW standards.

page 322.

›››

Overview

You will find further explanations, instructions

and restrictions on the technical specifica-

1

Coolant expansion tank

Engine oil dipstick

Engine oil filler cap

Brake fluid reservoir

Vehicle battery (underneath the cover)

Windscreen washer reservoir

We recommend that the oil change indicated

in the Maintenance Programme, be per-

formed by a technical service or specialised

workshop.

2

3

4

5

6

tions as of page 355.

›››

Engine oil

If the engine oil level is too low

You can get information about the correct en-

gine oil for your vehicle at your specialised

shop. If you have to change your engine oil,

use that oil.

General notes

The checking and refilling of service fluids are

carried out on the components mentioned

The engine comes with a special, multi-grade

oil that can be used all year round.

324

Checking and refilling levels

If the recommended engine oil is not availa-

ble, in the event of an emergency you can

add oil once up to a maximum of 0.5 L of the

next oil until the next oil change:

Warning lamp

Checking engine oil level

It lights up red



 Do not continue driving!

●

Valid for vehicles with petrol engines:

Engine oil pressure too low.

standard VW 504 00, VW 502 00,

VW 508 00, ACEA C or API SN.

It lights up yellow



Check the engine oil level as soon as possible.

Top up the oil at the next opportunity page 326.

Vehicles with diesel particulate filter*

›››

Only VW 507 00 engine oil, with reduced ash

formation, may be used in diesel engines

equipped with particulate filter. Using other

types of oil will cause a higher soot concen-

tration and reduce the life of the DPF. There-

fore:

It flashes yellow



Fig. 310 Engine oil dipstick.

Fault in the oil level sensor.

Take the vehicle to a specialised workshop to have

the system inspected. Until then it is advisable to

check the oil level every time you refuel.

Read the additional information carefully

^››› ^{page 47}

●

The engine oil dipstick indicates the level of

the oil.

Avoid mixing this oil with other engine oils.

If this warning symbol  starts to flash, and

is accompanied by three audible warnings,

switch off the engine and check the oil level. If

●

Only in exceptional circumstances, if the

engine oil level is too low page 325 and

›››

Checking oil level

you cannot obtain the oil specified for your

vehicle, you can use a small quantity of oil

(once) conforming to the specifications

VW 506 00, VW 506 01, VW 505 00,

VW 505 01 or ACEA B3/ACEA B4 (up to 0.5 l)

^››› ^{page 48.}

necessary, add more oil page 326.

›››

–

Park the vehicle in a horizontal position.

If the warning lamp  flashes although the

oil level is correct, stop driving. Do not even

run the engine at idle speed! Obtain technical

assistance.

–

Briefly run the engine at idle speed until the

operating temperature is reached and then

stop.

–

Wait for about two minutes.

Note

–

Pull out the dipstick. Wipe the dipstick with

Before a long trip, we recommend finding

an engine oil that conforms to the corre-

sponding VW specifications and recom-

mend keeping it in the vehicle. This way, the

correct engine oil will always be available

for a top-up if needed.

a clean cloth and insert it again, pushing it

in as far as it will go.

–

Then pull it out once more and check the oil

level Fig. 310. Top up with engine oil if

›››

»

necessary.

325

Practical tips

Depending on how you drive and the condi-

tions in which the vehicle is used, oil con-

sumption can be up to 0.5 l/1000 km. Oil

consumption is likely to be higher for the first

5,000 km. For this reason the engine oil level

must be checked at regular intervals, prefera-

bly when filling the tank and before a journey.

Topping up engine oil

CAUTION

If the oil level is above area Fig. 310

do not start the engine. This could result in

damage to the engine and catalytic con-

verter. Contact a specialised workshop.

A

,

›››

For the sake of the environment

WARNING

Any work carried out in the engine com-

partment or on the engine must be carried

out cautiously.

The oil level must never be above zone

A

Fig. 310 . Otherwise oil can be drawn in

›››

through the crankcase breather and leak

into the atmosphere via the exhaust sys-

tem.

●

Fig. 311 In the engine compartment: Engine oil

When working in the engine compart-

filler cap.

ment, always observe the safety warnings

›››

Note

page 322.

Read the additional information carefully

^››› ^{page 47}

Before a long trip, we recommend finding

an engine oil that conforms to the corre-

sponding VW specifications and recom-

mend keeping it in the vehicle. This way, the

correct engine oil will always be available

for a top-up if needed.

CAUTION

Before opening the bonnet, read and observe

A

If the oil level is above area , do not start

the engine. This could result in damage to

the engine and catalytic converter. Con-

tact a Technical Service.

the warnings

in Working in the engine

›››

compartment on page 322.

The position of the oil filler opening is shown

in the corresponding engine compartment il-

lustration page 324.

›››

Changing engine oil

Engine oil specification

^››› ^{page 48.}

Read the additional information carefully

^››› ^{page 47.}

WARNING

Oil is highly inflammable! Ensure that no oil

comes into contact with hot engine compo-

nents when topping up.

The engine oil must be changed at the inter-

vals given in the service schedule.

We recommend that you have the engine oil

changed by a Technical Service.

326

Checking and refilling levels

The oil change intervals are shown in the

Maintenance Programme.

Topping up coolant

For the sake of the environment

Because of disposal problems and the

–

Wait for the engine to cool down.

●

special tools and specialist knowledge re-

quired, we recommend that you have the

engine oil and filter changed by a Techni-

cal Service.

–

Cover the coolant expansion tank cap with

WARNING

Only change the engine oil yourself if you

have the specialist knowledge required!

a cloth and carefully unscrew it to the left

.

›››

–

Top up the coolant only if there is still cool-

ant in the expansion tank, otherwise you

could damage the engine. If there is no

coolant in the expansion tank, do not con-

tinue driving. You should obtain professional

●

Before opening the bonnet, read and ob-

●

Never pour oil down drains or into the

serve the warnings page 322.

›››

ground.

●

Wait for the engine to cool down. Hot oil

●

Use a suitable container when draining

may cause burn injuries.

the used oil. It must be large enough to hold

all the engine oil.

●

Wear eye protection to avoid injuries,

such as acid burns, caused by splashes of

oil.

assistance

.

›››

–

If there is still some coolant in the expansion

tank, top up to the upper mark.

●

When removing the oil drain plug with

Cooling system

your fingers, keep your arm horizontal to

help prevent oil from running down your

arm.

Top up with coolant until the level becomes

stable.

Topping up coolant

Screw the cap back on correctly.

●

Wash your skin thoroughly if it comes into

contact with engine oil.

Read the additional information carefully

^››› ^{page 49}

Any loss of coolant fluid normally indicates a

leak in the cooling system. Take the vehicle

straight to a specialised workshop to have

the cooling system examined. If there are no

leaks in the engine cooling system, a loss of

coolant can only occur if the coolant boils

and is forced out of the system as a result of

overheating.

●

Engine oil is poisonous! Used oil must be

stored in a safe place out of the reach of

children.

Top up coolant when the level is below the

MIN (minimum) mark.

Checking coolant level

CAUTION

–

Park the vehicle in a horizontal position.

No additives should be used with engine oil.

This could result in engine damage. Any

damage caused by the use of such addi-

tives would not be covered by the factory

warranty.

–

Switch the ignition off.

WARNING

–

Read off the coolant level on coolant ex-

pansion tank. When the engine is cold, the

coolant level should be between the marks.

When the engine is hot, it may be slightly

above the upper mark.

●

The cooling system is under pressure. Do

not unscrew the cap on the coolant expan-

sion tank when the engine is hot: risk of

burns!

»

327

Practical tips

CAUTION

The original additives should never be

mixed with coolants which are not ap-

proved by SEAT. Otherwise, you run the risk

of causing severe damage to the engine

and the engine cooling system.

However, if the brake fluid level goes down

noticeably in a short time, or drops below the

MIN mark, there may be a leak in the brake

system. Seek specialist assistance. A warning

light on the instrument panel display monitors

●

The antifreeze and coolant fluid can be a

health hazard. Therefore, the antifreeze

should be stored in the original container in

a safe place out of reach of children. Fail-

ure to comply could result in poisoning.

the brake fluid level page 123.

›››

●

If working inside the engine compart-

ment, remember that, even when the igni-

tion is switched off, the radiator fan may

start up automatically, and therefore there

is a risk of injury.

In right-hand drive vehicles the brake fluid

reservoir is on the other side of the engine

compartment.

●

If the fluid in the expansion tank is not

purple but is, for example, brown, this indi-

cates that the G13 additive has been mixed

with an inadequate coolant. The coolant

must be changed as soon as possible if this

is the case! This could result in serious

faults and engine damage.

Changing brake fluid

WARNING

The regular intervals at which the brake fluid

should be replaced are listed in the Mainte-

nance Programme. We recommend you have

it replaced at a SEAT Official Service, during

an Inspection Service.

If there is not enough anti-freeze in the

coolant system, the engine may fail lead-

ing to serious damage.

For the sake of the environment

●

Please make sure that the percentage of

Coolants and additives can contaminate

the environment. If any fluids are spilled,

they should be collected and correctly dis-

posed of, with respect to the environment.

additive is correct with respect to the low-

est expected ambient temperature in the

zone in which the vehicle is to be used.

WARNING

●

Brake fluid should be stored in the closed

●

When the outside temperature is very

original container in a safe place out of

reach of children. Risk of poisoning!

low, the coolant could freeze and the vehi-

cle would be immobilised. In this case, the

heating would not work either and inade-

quately dressed passengers could die of

cold.

●

If the brake fluid is left in the system for

Brake fluid

too long and the brakes are subjected to

heavy use, vapour bubbles may form in the

brake system. This would seriously affect

the efficiency of the brakes and the safety

of the vehicle. This may cause an accident.

Top up brake fluid

Read the additional information carefully

^››› ^{page 49}

CAUTION

Do not top up the expansion tank with cool-

ant fluid if it is empty! Air could enter the

cooling system. In this case, stop driving.

Seek specialist assistance. Otherwise,

there is a risk of engine damage.

CAUTION

Checking the brake fluid level

Brake fluid should not come into contact

with the vehicle paintwork, as it is abrasive.

The brake fluid level must be between the

MIN and MAX markings.

328

Checking and refilling levels

parts water); otherwise, a 1:4 proportion of

mixture in the washer fluid tank.

CAUTION

Windscreen washer reservoir

●

Do not mix cleaning products recommen-

ded by SEAT with other products. This

could lead to flocculation and may block

the windscreen washer jets.

Checking and topping up the wind-

screen washer reservoir

Capacity

The reservoir holds approximately 3 litres in

versions without headlight washer and 5 litres

in versions with headlight washer.

●

When topping up service fluids, make ab-

Read the additional information carefully

^››› ^{page 50}

solutely certain that you fill the fluids into

the correct reservoirs. Using the wrong flu-

ids could cause serious malfunctions and

engine damage!

Check the water level in the windscreen

washer reservoir regularly and top up as re-

quired.

WARNING

If the water from the windscreen washer

does not contain enough anti-freeze, it may

freeze on the windscreen and rear window,

reducing forward and rear visibility.

●

Not having windscreen wiper fluid re-

duces visibility through the windscreen,

and leads to loss of visibility in headlights

in models with headlight washer.

The container for the windscreen washer

contains the cleaning fluid for the wind-

screen, the rear window and the headlight

washer system*.

●

In winter, ensure the windscreen washer

contains enough anti-freeze.

●

In cold conditions, you should not use the

●

Open the bonnet  page 322.

The windscreen washer reservoir is marked

›››

windscreen wiper system unless you have

warmed the windscreen with the ventila-

tion system. The antifreeze could freeze on

the windscreen and reduce visibility.

Battery

●

with the symbol  on the cap.

●

General information

Check there is enough windscreen water in

the reservoir.

Read the additional information carefully

^››› ^{page 50.}

WARNING

Recommended windscreen wipers

Never mix an unsuitable antifreeze or other

similar additives with the windscreen wash-

er water. A greasy layer may be formed on

the windscreen which will impair visibility.

The battery is located in the engine compart-

ment and is almost maintenance-free. It is

checked as part of the Inspection Service.

Nevertheless, check the terminals are clean

and have the correct tightening torque, espe-

cially in summer and winter.

●

For the hottest seasons we recommend

summer G 052 184 A1 for clear glass. Propor-

tions of the mixture in the washer fluid tank:

1:100 (1 part concentrate per 100 parts wa-

ter).

●

Use clean water with a window cleaner

recommended by SEAT.

●

All year round, G 052 164 A2 for clear glass.

If necessary, add a suitable antifreeze to

the water in the reservoir.

Approximate proportion of the winter mixture,

up to -18°C (0°F): 1:2 (1 part concentrate per 2

Disconnecting the battery

The battery should only be disconnected in

exceptional cases. When the battery is

»

329

Practical tips

disconnected, some of the vehicle's functions

Winter conditions

Service or a workshop specialising in batter-

ies: risk of burns or exploding battery!

are “lost” ( table on page 330). These

›››

During the winter, the starting power may be

reduced, and if necessary, the battery should

functions will require resetting after the bat-

tery is reconnected.

The battery must not be opened. Never try

to change the fluid level of the battery. Oth-

erwise explosive gas is released from the bat-

tery that could cause an explosion.

be charged

in Important safety warn-

›››

ings for handling a vehicle battery on

page 330

Deactivate the anti-theft alarm* before you

disconnect the battery Otherwise the alarm

will be triggered.

Wear eye protection.



Function

Reprogramming

Warning lamp

Battery acid is very corrosive and caustic.

Wear protective gloves and eye protection. In

the event of electrolyte splashes, rinse off with

plenty of water.



One-touch function of

the electric windows

page 140, One-touch

›››

It lights up

opening and closing*.



Alternator fault.

If the vehicle does not re-

spond to the key, they

should be synchronised

Fires, sparks, open flames and smoking are

prohibited.







Remote control key

The control lamp lights up when the ignition is

switched on. It should go out when the engine

has started running.

page 135.

›››

The battery should only be charged in a well-

ventilated zone. Risk of explosion!

Digital clock

page 114.

If the control lamp  lights up while driving,

the alternator is no longer charging the bat-

tery. You should immediately drive to the

nearest specialised workshop.

Keep children away from acid and batteries!

After driving for a few me-

tres, the warning lamp

goes out again.

ESC warning lamp

WARNING

●

When repairing or working on the electri-

cal system, proceed as follows:

If the vehicle is not used for long periods

You should avoid using electrical equipment

that is not absolutely necessary because this

will drain the battery.

The vehicle has a system for monitoring the

current consumption when the engine is left

–

1. Remove the key from the ignition. The

negative cable on the battery must be

disconnected.

unused for long periods of time page 261.

›››

Some functions, such as the interior lights, or

the remote door opening, may be temporarily

disabled to prevent the battery from running

flat. These functions will come back on as

soon as the ignition is switched on and the

engine started.

–

2. When the repair is finished, recon-

nect the negative pole of the battery.

Important safety warnings for han-

dling a vehicle battery

●

Switch off all electrical devices before

reconnecting the battery. Reconnect first

the positive cable and then the negative

cable. Never reverse the polarity of the

All work on batteries requires specialist

knowledge. Please refer to a SEAT Official

330

Checking and refilling levels

–

Only use a charger which is compatible for

use with 12 V nominal voltage batteries. The

charge must not exceed a voltage of 15 V.

Replacing the battery

connections. This could cause an electrical

fire.

The new battery should have the same speci-

fications (amperage, load and voltage) as

the used battery.

●

Ensure that the vent hose is always con-

nected to the battery.

–

Now connect the battery charger to the

power socket and switch on.

●

Never use damaged batteries. This could

Your vehicle is equipped with an intelligent

power management system to control the

distribution of electrical energy page 261.

cause an explosion! Replace a damaged

battery immediately.

At the end of the charging process: switch

off the battery charger and disconnect the

power socket cable.

›››

The power management function ensures

that the battery is charged much more effi-

ciently than on vehicles without a power

management system. To maintain this func-

tion after replacing the battery, we recom-

mend that the replacement battery used is of

the same make and type as the original fitted

battery. To make proper use of the power

management function after the battery has

been changed, have the battery coded to the

power management mode at a specialised

workshop.

CAUTION

–

Finally disconnect the charger cables from

the battery.

●

Never disconnect the battery if the igni-

tion is switched on or if the engine is run-

ning. This could damage the electrical sys-

tem or electronic components.

–

Replace the battery cover correctly.

Close the bonnet

^››› ^{page 18.}

Important: Before you charge the battery

make sure you read the manufacturer's in-

structions for using the battery charger.

Charging the battery

Terminals for charging the battery are fitted in

the engine compartment.

WARNING

Never charge a battery that has frozen: re-

place it! Failure to do so may lead to an ex-

plosion.

–

Note the warnings

in Important safe-

ty warnings for handling a vehicle bat-

tery on page 330 and

›››

CAUTION

●

Some vehicles, for example those with

.

›››

the Start-Stop system* are fitted with a

special battery (AGM-type or EFB-type

battery). If any other type of battery is fit-

ted, the Start-Stop function may be consid-

erably reduced and the vehicle may not

stop on repeated occasions.

–

Switch off all electrical devices. Remove

the ignition key.

Note

Use only the terminals in the engine com-

partment to charge the battery.

–

Raise the bonnet

^››› ^{page 18.}

Open the battery cover.

●

Connect the charger clamps as described

to the positive pole of the battery (+) and

exclusively to an earth on the bodywork

(–).

Make sure that the vent hose is always

attached to the original opening on the

side of the battery. Gases or battery acid

»

331

Practical tips -> Checking and refilling levels for Your Seat Leon 4 Door Third Generation (2012-2020)

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