Get Practical tips -> Fuel Guide for Seat Leon 4 Door Third Generation (2012-2020)

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).

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):

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

Diesel with biodiesel (“B” stands for Bio-

diesel). The number indicates the per-

Depending on country

Follow the regulations of the country you are

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.

This motor is only available in some markets.

Depending upon country.

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 -> Fuel for Your Seat Leon 4 Door Third Generation (2012-2020)

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