Get General maintenance -> Checking and topping up fluids Guide for Audi S5 4 Door Fourth Generation (2017-2024)

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Checking and topping up fluids

Bonnet

Opening the bonnet

Releasing the bonnet

The bonnet is released from inside the vehicle.

Fig. 211 Release catch

under the bonnet

Fig. 210 Detail of foot-

well on driver's side:

Release lever

Before opening the bonnet make sure that the windscreen

wiper arms are not lifted away from the glass. Otherwise the

paint may get damaged.

– Open the driver's door.

– Lift the bonnet slightly ⇒

.

– Pull the lever under the dashboard in the direction indi-

– Press the release catch under the bonnet upwards

cated (arrow) ⇒ fig. 210.

⇒ fig. 211. This will release the arrester hook.

– Open the bonnet.

The bonnet springs out of its lock.

The bonnet is held open by two gas-filled struts.

WARNING

To avoid the risk of being scalded, never open the bonnet if you see

steam or coolant escaping from the engine compartment. Wait

until no steam or coolant can be seen before opening the bonnet.

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221

Working on components in the engine

compartment

WARNING (continued)

• Observe the following additional warnings if work on the fuel

Extra caution is necessary when working on components

in the engine compartment.

system or the electrical system is necessary:

− Always disconnect the battery.

− Do not smoke.

Always be aware of the danger of injury and scalding as well as the

risk of accident or fire when working in the engine compartment

(e.g. when checking and refilling fluids). Always observe the warn-

ings listed below and follow all normal safety precautions. The

engine compartment of any motor vehicle is a potentially

− Never work near naked flames.

− Always keep an approved fire extinguisher immediately

available.

hazardous area. ⇒

.

Caution

When topping up fluids make sure the correct fluid is put into the

correct filler opening. This can otherwise cause serious malfunc-

tions or engine damage.

WARNING

• Switch off the engine.

• Remove the ignition key.

• Apply the parking brake.

For the sake of the environment

• Move the gear lever into neutral.

• Wait for the engine to cool down.

• Keep children away from engine compartment.

Inspect the ground underneath your vehicle regularly so that any

leaks are detected at an early stage. If you find oil spots or other

fluids, have your vehicle inspected by a qualified workshop.

• Never spill fluids on hot engine components. These fluids can

cause a fire (e.g. radiator anti-freeze).

Note

• Take care not to cause short circuits in the electrical system,

On right-hand drive vehicles* some of the containers/ reservoirs

mentioned below are located on the other side of the engine

compartment.

especially when working on the battery.

• Do not touch the radiator fan when the engine is hot. The fan

may start running suddenly.

• Do not unscrew the cap on the expansion tank when the engine

Closing the bonnet

is hot. The cooling system is under pressure.

• Protect face, hands and arms by covering the cap with a large,

– To close the bonnet, pull it down to overcome the spring

pressure.

thick rag to protect against escaping coolant and steam.

• If any tests have to be performed with the engine running,

there is an extra safety risk from the rotating parts, such as the

drive belts, alternator and radiator fan, etc., and from the high-

voltage ignition system.

– Then let it drop into the catches; do not press down ⇒

.

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Checking and topping up fluids

1

A Jump-start terminal (+) under a cover . . . . . . . . . . . . .

230, 256

227

WARNING

2

A Brake fluid reservoir () . . . . . . . . . . . . . . . . . . . . . . . .

3

224

223

225

231

A Engine oil filler cap () . . . . . . . . . . . . . . . . . . . . . . . .

• For safety reasons the bonnet must always be completely

closed when the vehicle is moving. After closing it always check

that it is properly secured. The bonnet must be flush with the adja-

cent body panels.

4

A Engine oil dipstick (orange) . . . . . . . . . . . . . . . . . . . . . .

5

A Radiator expansion tank () . . . . . . . . . . . . . . . . . . . . .

6

A Windscreen washer container () . . . . . . . . . . . . . . . .

• Should you notice that the bonnet is not safely secured when

the vehicle is moving, stop the vehicle immediately and close the

bonnet properly, otherwise it could cause an accident.

7

A Jump-start terminal (-) with hexagon head . . . . . . . . . 230, 256

8

A Hydraulic fluid reservoir for power steering . . . . . . . .

190

Engine oil

Engine compartment layout

General notes

Engine compartment layout

Main components for checking and refilling

We recommend that you have the oil change carried out by an Audi

dealership/qualified workshop according to the intervals stated in

the Service Schedule or according to the service interval display in

the instrument cluster.

Whether your vehicle is serviced at flexible service intervals or fixed

service intervals is shown in the Service Schedule.

The correct oil specifications for your engine are listed in the Tech-

nical data section ⇒ page 281, “Performance, weights and dimen-

sions”.

Check that the specifications quoted (VW standards) appear on the

container either singly or in combination with other specifications.

Flexible service intervals (Audi LongLife Service*)

Special engine oils ⇒ page 281, “Performance, weights and dimen-

sions” have been developed as part of the Audi LongLife Service

(⇒ “Service Schedule”).

This type of oil must be used if you intend to take advantage of the

extended maintenance intervals allowed by Audi's LongLife Service.

Fig. 212 Locations of fluid containers, engine oil dipstick and engine oil filler

cap

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Checking and topping up fluids

Checking oil level

223

• Do not mix the LongLife oil with oil intended for fixed service

intervals, as the requirements for the extended service intervals are

then no longer guaranteed.

– Park your vehicle on a level surface.

– Allow the warm engine to run briefly at idling speed and

then switch off the ignition.

• In exceptional circumstances, if the engine oil level is too low

⇒ page 223 and you cannot obtain the specified LongLife oil, you

can put in a small quantity of oil for fixed service intervals -

⇒ page 281, “Performance, weights and dimensions”. This should

not be done more than once and no more than 0.5 litres should be

used.

– Wait approx. 2 minutes.

– Pull out the dipstick. Wipe the dipstick with a clean cloth

and insert it again, pushing it in as far as it will go.

Fixed service intervals (Inspection Service)*

– Then pull the dipstick out again and check the oil level

⇒ fig. 213. If the oil level is too low, add more engine oil

⇒ page 224.

If you do not take advantage of the Audi LongLife service for your

car, you can use the oils for fixed service intervals - ⇒ page 281,

“Performance, weights and dimensions”. In this case, your car must

be serviced after a fixed interval of 1 year / 15,000 km (10,000 miles)

– see Service Schedule.

a

Oil level in area A

– Do not top up oil.

• In exceptional circumstances, if the engine oil level is too low

⇒ page 223 and you cannot obtain the oil specified for your vehicle,

you can put in a small quantity of oil conforming to the specification

ACEA A2 or ACEA A3. This should not be done more than once and

no more than 0.5 litres should be used.

b

Oil level in area A

– Oil can be topped up. After topping up the oil level should

a

be in area A.

c

Oil level in area A

Checking the oil level

– Oil must be topped up. After topping up the oil level

a

should be in area A.

Depending on how you drive and the conditions in which the car is

used, oil consumption can be up to 0.5 ltr./1000 km. Oil consump-

tion is likely to be higher for the first 5000 km. For this reason the

engine oil level must be checked at regular intervals, preferably

when filling the tank and before a journey.

Fig. 213 Markings on

oil dipstick

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Checking and topping up fluids

• No additives should be used with engine oil. Any damage caused

by the use of such additives would not be covered by the factory

warranty.

Topping up the engine oil 

For the sake of the environment

• Never pour oil down drains or into the ground.

• Always observe statutory requirements when disposing of

empty oil canisters.

Fig. 214 Engine

compartment: Engine

oil filler cap

Cooling system

– Unscrew cap  from oil filler opening ⇒ fig. 214.

Coolant

– Carefully put in the specified grade of oil ⇒ page 281

The purpose of the coolant is to carry heat away from the

engine. The correct amount of anti-freeze is important to

prevent the cooling system from freezing in winter.

0.5 litres at a time.

– After two minutes check the oil level once again

⇒ page 223.

The cooling system is filled for life at the factory, so the coolant does

not need to be changed. The coolant consists of a mixture of water

and anti-freeze additive G12+. This is a glycol-based anti-freeze with

anti-corrosion additives.

– If the oil level is too low, add more engine oil.

– Replace the oil filler cap carefully and push the dipstick

all the way in.

Anti-freeze additive

The amount of anti-freeze additive required depends on the temper-

atures to be expected in the winter season. If the anti-freeze concen-

tration is too low the coolant can freeze, resulting in failure of the

cooling system and heater.

WARNING

• Ensure that no oil comes into contact with hot engine compo-

nents when topping up: this could cause a fire.

The cooling system is filled at the factory with the correct amount of

anti-freeze for the country concerned.

• Wash your skin thoroughly if it comes into contact with engine

oil.

In most cases the mixture consists of 60% water and 40% additive.

This mixture gives the necessary antifreeze protection down to –

25 °C and protects the alloy parts of the cooling system against

corrosion. It also prevents scaling and raises the boiling point of the

coolant.

Caution

a

• The oil level must never be above area A, as this may result in

damage to the catalytic converter or to the engine. Contact a quali-

fied workshop to extract the engine oil if necessary.

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Checking and topping up fluids

225

Countries with warm climate

Checking coolant level

The coolant level can be checked at a glance.

The coolant concentration must not be reduced by adding plain

water, even in the summer or in warm climates. The concentration

of the anti-freeze additive must always be at least 40%.

Countries with cold climate

If greater anti-freeze protection is required in very cold climates, the

proportion of the anti-freeze additive G12+ can be increased. A

concentration of 60% offers protection down to about -40 °C. The

concentration of the antifreeze additive must not be more than 60%,

otherwise this would reduce the antifreeze protection. In addition,

the cooling effect will be adversely affected.

Fig. 215 Engine

compartment: Mark-

ings on radiator expan-

sion tank

Vehicles for export to countries with a cold climate (such as Sweden,

Norway and Finland) are supplied with antifreeze protection down

to about -35 °C. The concentration of the antifreeze additive for

these countries should always be at least 50%.

– Switch off the ignition.

– Read off coolant level on radiator expansion tank

⇒ fig. 215. When the engine is cold it should be between

the “MIN” and “MAX” marks. When the engine is hot it

may be slightly above the “MAX” mark.

Caution

• It is advisable to have the cooling system checked before the

winter season to make sure that the antifreeze concentration is

adequate for the conditions to be expected. This applies particularly

if you intend to take the car into a colder climate zone. If necessary,

have the anti-freeze concentration increased to 50 - 60% as required.

The coolant level should be checked with the engine switched off.

The coolant level is monitored by a warning lamp in the instrument

cluster ⇒ page 32. However, we recommend that it should be

checked occasionally.

• Use only anti-freeze additive G12+, an additive meeting the spec-

ification “TL-VW 774 F ”. Other additives may give considerably infe-

rior corrosion protection. The resulting corrosion in the cooling

system can lead to a loss of coolant, causing serious damage to the

engine.

Coolant losses

Any loss of coolant normally indicates a leak in the cooling system.

In this case the cooling system should be inspected by a qualified

workshop without delay. It is not sufficient merely to top up the

coolant.

• The coolant additive G12+ can be mixed only with additives G11

and G12.

If there are no leaks in the system, a loss of coolant can only occur

if the coolant boils and is forced out of the system as a result of

overheating.

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Caution

WARNING

Radiator sealants must not be added to the coolant. Such additives

could seriously impair the function of the cooling system.

• The cooling system is under pressure. Do not unscrew the cap

on the expansion tank when the engine is hot: you could be

scalded by escaping steam

• The coolant and coolant additive can be a health hazard. Store

the coolant additive in the original container in a safe place out of

reach of children – risk of poisoning.

Topping up the coolant

Be careful when topping up coolant.

– Switch off the engine.

For the sake of the environment

– Wait for the engine to cool down.

Drained off coolant should not be used again. Drain off the used

coolant into a suitable container and dispose of it in the proper

manner (observe environmental regulations).

– Cover the cap on the expansion tank ⇒ page 225, fig. 215

with a cloth, and carefully unscrew the cap anti-clock-

wise ⇒

.

– Add coolant.

Radiator fan

– Screw the cap on again tightly.

The radiator fan can start running spontaneously.

The radiator fan is driven by the engine via a poly V-belt. The speed

of the fan is varied by a viscous clutch according to the temperature.

Make sure that the coolant meets the required specifications

⇒ page 224, “Coolant”. Do not use a different type of additive if anti-

freeze additive G12+, G12 or G11 is not available. In this case use

only water and bring the coolant concentration back up to the

correct level as soon as possible by putting in the specified additive.

There is also an auxiliary electric fan, which cuts in automatically

whenever the temperature of the coolant and the engine compart-

ment rises above a certain level.

Always top up with fresh, unused coolant.

The auxiliary fan can continue to run for as long as 10 minutes after

stopping the engine – even after the ignition is switched off. It may

Do not fill above the “MAX” mark. Excess coolant is forced out of the

system through the valve in the filler cap when the engine gets hot.

also start running suddenly ⇒

after a while if

• residual heat raises the coolant temperature, or

If a lot of coolant has been lost, wait for the engine to cool down

before putting in cold coolant. Failure to do so could result in

serious engine damage.

• the hot engine compartment is additionally heated up by the

sun.

WARNING

When working in the engine compartment be aware that the radi-

ator fan may start running suddenly – risk of injury.

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Changing brake fluid

227

Brake fluid

When required, the brake fluid should be changed by a

competent mechanic with the proper equipment.

Checking brake fluid level

The brake fluid level can be checked at a glance.

Brake fluid gradually absorbs moisture from the atmosphere. If the

water content in the brake fluid is too high, this may cause corrosion

in the brake system over time. In addition, the boiling point of the

brake fluid will be considerably reduced. This could adversely affect

the braking ability in certain circumstances.

For this reason the brake fluid must be changed periodically.

Your vehicle's Service Schedule will tell you when the brake fluid has

to be changed.

Fig. 216 Engine

compartment: Mark-

ings on brake fluid

reservoir

It is advisable to have the brake fluid changed as part of a regular

Inspection Service at your Audi workshop. They are familiar with the

procedure and have the necessary special tools and spare parts as

well as the proper facilities for disposing of the old fluid.

– Check the fluid level on the brake fluid reservoir

⇒ fig. 216. It should always be between the “MIN” and

“MAX” marks.

Use only the genuine brake fluid specified by the factory Qualified

workshops know that the brake fluid “DOT 4” is approved by Audi.

The brake fluid must be fresh and unused.

In right-hand drive vehicles the brake fluid reservoir is on the other

side of the engine compartment.

WARNING

The fluid level may drop slightly after a period of time due to the

• Brake fluid is poisonous; store it in the sealed original container

automatic compensation for brake pad wear. This is quite normal.

in a safe place out of reach of children.

However, if the level goes down noticeably in a short time, or drops

below the “MIN” mark, there may be a leak in the brake system. If

the fluid level in the reservoir is too low, this will be indicated by the

brake warning lamp ⇒ page 31. If this should happen, take the car

to a qualified workshop immediately and have the brake system

inspected.

• Heavy use of the brakes may cause a vapour lock if the brake

fluid is left in the system for too long. This would seriously affect

the efficiency of the brakes and the safety of the car – risk of acci-

dent.

Caution

Please note that brake fluid will attack the paintwork on contact.

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Checking and topping up fluids

Please note that certain convenience features, such as the Audi

advanced key*, the remote control key or the electrical seat adjust-

ment may not be available when you unlock the vehicle. These func-

tions will be restored when you switch on the ignition and start the

engine.

For the sake of the environment

If the fluid has to be drained out of the brake system, use an appro-

priate container to catch the used brake fluid and dispose of it in the

proper manner.

Winter conditions

At low temperatures the battery has to work very hard. It also

provides only a fraction of the starting power it has at normal

temperatures.

Battery

General notes

For this reason, we recommend having the battery checked and

charged if necessary before the start of winter ⇒ page 230.

All work on batteries requires specialist knowledge.

The battery is virtually maintenance-free. It is checked as part of the

Inspection Service.

WARNING

We recommend that you replace a battery once it is older than 5

years.

• All work on batteries requires specialist knowledge. For queries

regarding the vehicle battery please contact an Audi dealership or

other qualified workshop (risk of chemical burns / risk of explo-

sion).

When an airbag is triggered, the battery will, under certain circum-

stances, be disconnected from the on-board power supply for

safety reasons ⇒

page 166.

in “General notes on airbag system” on

• The battery must not be opened. Do not attempt to make any

changes to the electrolyte level of the battery. Otherwise, there is

a risk that a mixture of oxygen and hydrogen gas can accumulate

and cause an explosion.

Disconnecting the battery

If the battery is disconnected, some of the vehicle's functions will

become inoperative (e.g. electric windows). These functions will

require resetting after the battery is reconnected. For this reason,

the battery should only be disconnected from the vehicle's electrical

system when absolutely necessary.

Note

If the vehicle is to be left standing for a period of several weeks at

extremely low temperatures, the battery should be removed from

the vehicle. This ensures that it cannot “freeze up” and be

damaged.

If the vehicle is not used for long periods

If you do not drive your vehicle for a period of several days or weeks,

the power management will gradually shut off the on-board

systems one by one, or reduce the amount of current they are using.

This limits the amount of power consumed and helps to ensure reli-

able starting even after a long period ⇒ page 192.

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Checking and topping up fluids

229

Important safety warnings for handling a car

battery

WARNING (continued)

charges) when handling cables and electrical equipment. Never

cross the battery poles. The resulting high-energy sparks can

cause injury.

All work on batteries requires specialist knowledge.

The vehicle battery is located under the floor panel in the luggage

compartment.

• A highly explosive mixture of gases is given off when the

battery is under charge. Only charge battery in a well ventilated

area.

Wear safety glasses!



• Keep children away from the battery and battery acid.

• Switch off all electrical equipment before starting any work on

the vehicle electrical system. Remove the ignition key. The minus

cable of the battery must be disconnected. When changing a light

bulb, it is sufficient to only turn off the light.

Battery acid is extremely corrosive. Wear protec-

tive gloves and safety glasses.



Keep open flames, sparks, uncovered lights and

lit cigarettes away from battery!



• Before disconnecting the battery, turn off the anti-theft

A highly explosive mixture of gases is given off

when the battery is under charge!

system! Otherwise, the alarm will sound.



• When disconnecting the battery from the vehicle's electrical

Keep children away from the battery and battery

acid.

system, first disconnect the minus cable and then the plus cable.



• Before reconnecting the battery, turn off all electrical equip-

ment. First connect the plus cable, then the minus cable. The

battery cables must not be connected to the wrong battery poles

- serious risk of cable fire.

WARNING

Always be aware of the danger of injury and chemical burns as

well as the risk of accident or fire when working on the battery and

the electrical system.

• Never charge a frozen or thawed out battery - risk of explosion

and chemical burns! A battery must be replaced once it has been

frozen. When it is discharged the battery can freeze at tempera-

tures around 0°C.

• Wear safety glasses. Do not allow acid or lead particles to come

into contact with eyes, skin or clothing.

• Make sure that the vapour hose is always attached to the

• Battery acid is extremely corrosive. Wear protective gloves and

safety glasses. Do not tilt the battery - acid can leak out of the

vapour vent. If electrolyte should splash into the eyes rinse at once

for several minutes using clear water. Then seek medical care

immediately. Neutralize any acid splashes on the skin or clothing

with soap solution, and rinse off with plenty of water. If acid is

swallowed by mistake, consult a doctor immediately.

battery.

• Never use a damaged battery - risk of explosion! Replace a

damaged battery immediately.

Caution

• Never disconnect the car's battery with the engine running or

with the ignition turned on, otherwise the electrical system or elec-

trical components will be damaged.

• Keep open flames, sparks, uncovered lights and lit cigarettes

away from battery. Avoid sparks (including those from static

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Checking and topping up fluids

• Do not expose the battery to direct sunlight over a long period of

time, as the intense ultraviolet radiation can affect the battery

housing.

– Now connect the battery charger to the mains and switch

on.

– After charging the battery: switch off the battery charger

and disconnect the mains cable.

• If the car is left standing for long periods, protect the battery

from extreme cold temperature so that it does not “freeze up” and

become damaged.

– Now disconnect the charger cables.

– Refit the red cap onto the positive terminal.

– Close the bonnet ⇒ page 221.

Charging the battery

Terminals for charging the battery are fitted in the engine

compartment.

When it is discharged the battery can freeze at temperatures

around 0°C. A frozen battery must be thawed before charging ⇒

However, it is advisable to replace the battery if it has frozen,

because the ice can crack the battery casing and allow the battery

acid to escape.

.

Charging the battery

Important: Before you charge the battery make sure you read the

manufacturer's instructions for using the battery charger.

Fig. 217 Engine

When charging with a low current (for instance with a small battery

charger) the battery does not have to be disconnected. The battery

must not be opened while you are charging it.

compartment: Termi-

nals for jump leads and

battery charger

Fast-charging the battery

– Note the warnings ⇒

in “Important safety warnings

for handling a car battery” on page 229 and ⇒

.

For technical reasons it is not permissible to fast-charge the battery

using charging devices with an output voltage higher than 14.8 V.

– Switch off all electrical equipment. Remove the ignition

key.

WARNING

– Open the bonnet ⇒ page 220.

Never charge a frozen battery – it could explode.

– Open the red cap on the positive terminal ⇒ fig. 217.

– Follow the correct procedure for connecting the charger

cables to the jump-start terminals (terminal with red cap

= “positive”, terminal with hexagon = “negative”).

Note

Use only the terminals in the engine compartment to charge the

battery.

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Checking and topping up fluids

231

Replacing the battery

Windscreen washer

A replacement battery must have the same specifications

as the original equipment battery.

Plain water on its own is not sufficient for the windscreen

washer system.

Your vehicle is equipped with an intelligent power management

system to control the distribution of electrical energy ⇒ page 192.

The power management function ensures that the battery is

charged much more efficiently than on vehicles without a power

management system. For this additional power to be available after

replacing the battery, we recommend that the replacement battery

used is of the same make and type as the original-equipment

battery. The battery must be encoded in the control unit for power

management. This has to be done by a qualified workshop.

Fig. 218 Engine

compartment: Wind-

screen washer

container

A replacement battery must have the same capacity, voltage (12 V)

and current rating. It must also have the same dimensions as the

original, factory-fitted battery and have sealed caps. The battery

must comply with the standards TL 825 06 (dated December 1997 or

later) and VW 7 50 73 (August 2001 or later).

The container for the windscreen washer  contains the cleaning

fluid for the windscreen and the headlight washer system*

⇒ fig. 218. Container capacity: ⇒ page 279.

Plain water on its own is not enough to clean the glass properly. It

is therefore advisable to add a suitable washer fluid additive (with

wax solvent) to the water. A washer fluid with freeze-resistant addi-

tive should be used in winter.

Caution

• Make sure that the vent hose is always attached to the opening

on the side of the battery. Gases or battery acid can otherwise

escape and possibly cause damage.

• The battery holder and clamps must always be correctly secured.

• Before starting any work on the battery, always observe the

warnings listed under ⇒ page 229, “Important safety warnings for

handling a car battery”.

Caution

• Never put in radiator anti-freeze or other additives.

• Never use washer fluid which contains paint thinners or solvents

as it can damage the paintwork.

For the sake of the environment

 Batteries contain toxic substances including sulphuric acid and

lead. They must be disposed of appropriately and must not be put

together with ordinary household waste. Make sure the battery

removed from the vehicle cannot tip over. Otherwise, sulphuric acid

could escape.

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General maintenance -> Checking and topping up fluids for Your Audi S5 4 Door Fourth Generation (2017-2024)

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