Get Maintenance and care -> Engine compartment Guide for Mercedes G Class SUV Third Generation (1990-2018)

Useful information

This Operator's Manual describes all

models and all standard and optional

equipment of your vehicle available at the

time of publication of the Operator's

Manual. Country-specific differences are

possible. Please note that your vehicle may

not be equipped with all features

described. This also applies to safety-

related systems and functions.

Read the information on qualified

specialist workshops: (Y page 24).

Engine compartment

Hood

Important safety notes

WARNING

If the hood is unlatched, it may open up when

the vehicle is in motion and block your view.

There is a risk of an accident.

Never unlatch the hood while driving.

WARNING

Certain components in the engine

compartment may be very hot, e.g. the drive

system and radiator. Working in the engine

compartment poses a risk of injury.

If possible, let the drive system cool down and

only touch the following described

components.

WARNING

Opening the hood when the engine is

overheated or when there is a fire in the

engine compartment could expose you to hot

gases or other service products. There is a

risk of injury.

Let an overheated engine cool down before

opening the hood. If there is a fire in the

engine compartment, keep the hood closed

and contact the fire department.

WARNING

The engine compartment contains moving

components. Certain components, such as

the radiator fan, may continue to run or start

again suddenly when the ignition is off. There

is a risk of injury.

If you need to do any work inside the engine

compartment:

switch off the ignition

never reach into the area where there is a

risk of danger from moving components,

such as the fan rotation area

remove jewelery and watches

keep items of clothing and hair, for

example, away from moving parts

WARNING

The engine is equipped with a transistorized

ignition system. Because of the high voltage,

it is dangerous to touch any components

(ignition coils, spark plug sockets, diagnostic

socket) of the ignition system:

with the engine running

while starting the engine

when the ignition is switched on and the

engine is turned manually

WARNING

When the hood is open and the windshield

wipers are set in motion, you can be injured

by the wiper linkage. There is a risk of injury.

Always switch off the windshield wipers and

the ignition before opening the hood.

Make sure that the windshield wipers are

not folded away from the windshield. You

could otherwise damage the windshield

wipers or the hood.

Do not touch the following when the ignition

is switched on:

ignition coils

spark plug connectors

test socket

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Engine compartment

Maintenance and care

Opening the hood

The release lever on the hood is in the footwell

on the left-hand side of the vehicle when

viewed in the direction of travel.

Make sure that the windshield wipers are

turned off.

Pull release lever : on the hood.

The hood is released.

Lift the hood slightly.

Push hood catch handle ; in the direction

of the arrow and lift the hood.

Closing the hood

WARNING

If the hood is unlatched, it may open up when

the vehicle is in motion and block your view.

There is a risk of an accident.

Never unlatch the hood while driving.

Lower the hood and let it fall from a height

of approximately 8 inches (20 cm).

Check that the hood has engaged properly.

If the hood can be raised slightly, it is not

properly engaged. Open it again and close

it with a little more force.

Engine oil

Notes on the oil level

Depending on your driving style, the vehicle

consumes up to 0.9 US qt (0.8 liters) of oil per

600 miles (1000 km). The oil consumption

may be higher than this when the vehicle is

new or if you frequently drive at high engine

speeds.

Checking the oil level using the oil

dipstick

Example: oil dipstick

When checking the oil level:

park the vehicle on a level surface.

the engine should be switched off for

approximately five minutes if the engine is

at normal operating temperature.

the engine should be switched off for at

least 30 minutes if the engine is not at

operating temperature, e.g. if you only start

the engine briefly.

Pull oil dipstick : out of the dipstick guide

tube.

Wipe off oil dipstick :.

Engine compartment

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Maintenance and care

Slowly slide oil dipstick : into the guide

tube to the stop, and take it out again.

If the level is between MIN mark = and

MAX mark ;, the oil level is correct.

Add oil if necessary.

Checking the oil level using the on-

board computer

Do not add too much oil. adding too much

engine oil can result in damage to the

engine or to the catalytic converter. Have

excess engine oil siphoned off.

G 65 AMG: the oil level can be checked using

the on-board computer only.

On all other models, the oil dipstick must be

used to check the engine oil level.

When checking the oil level:

park the vehicle on a level surface.

the engine should be switched off for

approximately five minutes if the engine is

at normal operating temperature.

Make sure that the SmartKey is in position

2 in the ignition lock.

Press the & or * button on the

steering wheel to select the following

message:

The measurement takes a few seconds. You

will see one of the following messages in the

multifunction display:

Engine Oil Level OKEngine Oil Level OK

Add 1.0 qtAdd 1.0 qt (Canada: 1.0 liter1.0 liter) toto

reach maximum oil level.

Add 1.5 qtsAdd 1.5 qts (Canada: 1.5 liters1.5 liters) toto

reach maximum oil level.

AddAdd 2.0 qts.2.0 qts. (Canada: 2.0 liters2.0 liters) toto

reach maximum oil level.reach maximum oil level.

Add oil if necessary.

If the engine is at normal operating

temperature and the

Engine oil ReduceEngine oil Reduce

oil

oil levellevel display appears, too much oil has

been added.

Have excess oil siphoned off.

If the

Switch on ignition to checkSwitch on ignition to check

engine oil level

engine oil level message appears:

Turn the SmartKey to position 2 in the

ignition lock (Y page 139).

If the

Observe waiting timeObserve waiting time message

appears:

If the engine is at normal operating

temperature: repeat the measurement

after about five minutes.

If the engine is not at normal operating

temperature: e.g. if the engine was only

started briefly, repeat the measurement

after approximately 30 minutes.

If the

Engine oil level Not whenEngine oil level Not when

engine on

engine on message appears:

Switch off the engine.

If the engine is at normal operating

temperature: wait about five minutes

before carrying out the measurement.

If the engine is not at normal operating

temperature: e.g. if the engine was only

started briefly, wait approximately

30 minutes before carrying out the

measurement.

If you wish to cancel the measurement,

press the * or & button on the

multifunction steering wheel.

Adding engine oil

Environmental note

When adding oil, take care not to spill any. If

oil enters the soil or waterways, it is harmful

to the environment.

Only use engine oils and oil filters that

have been approved for vehicles with a

service system. You can obtain a list of the

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Engine compartment

Maintenance and care

engine oils and oil filters tested and

approved in accordance with the

Mercedes-Benz Specifications for Service

Products at any Mercedes-Benz Service

center.

Damage to the engine or exhaust system is

caused by the following:

using engine oils and oil filters that have

not been specifically approved for the

service system

replacing engine oil and oil filters after

the interval for replacement specified by

the service system has been exceeded

using engine oil additives.

Do not add too much oil. If the oil level is

above the "max" mark on the dipstick, too

much oil has been added. This can lead to

damage to the engine or the catalytic

converter. Have excess oil siphoned off.

Example: engine oil cap

Turn cap : counter-clockwise and remove

it.

Add the amount of oil required.

Observe the specifications in the on-board

computer when doing so or fill carefully to the

maximum mark on the oil dipstick.

Further information on engine oil

(Y page 346).

The difference between the minimum

mark and the maximum mark on the oil

dipstick is approximately 2.1 US qt (2 l).

Replace cap : on the filler neck and

tighten clockwise.

Ensure that the cap locks into place

securely.

Additional service products

Checking coolant level

WARNING

The engine cooling system is pressurized,

particularly when the engine is warm. When

opening the cap, you could be scalded by hot

coolant spraying out. There is a risk of injury.

Let the engine cool down before opening the

cap. Wear eye and hand protection when

opening the cap. Open the cap slowly half a

turn to allow pressure to escape.

Park the vehicle on a level surface.

Only check the coolant level when the

vehicle is on a level surface and the engine

has cooled down.

Turn the SmartKey to position 2 in the

ignition lock (Y page 139).

Check the coolant temperature display in

the instrument cluster.

The coolant temperature must be below

158 ‡ (70 †).

Slowly turn cap : half a turn counter-

clockwise to allow excess pressure to

escape.

Engine compartment

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Maintenance and care

Turn cap : further counter-clockwise and

remove it.

If the coolant is at the level of marker bar

= in the filler neck when cold, there is

enough coolant in coolant expansion

tank ;.

If the coolant level is approximately 0.6 in

(1.5 cm) above marker bar = in the filler

neck when warm, there is enough coolant

in expansion tank ;.

If necessary, add coolant that has been

tested and approved by Mercedes-Benz.

Replace cap : and turn it clockwise as far

as it will go.

For further information on coolant, see

(Y page 348).

Adding washer fluid to the windshield

washer system/headlamp cleaning

system

WARNING

Windshield washer concentrate is highly

flammable. If it comes into contact with hot

engine components or the exhaust system it

could ignite. There is a risk of fire and injury.

Make sure that no windshield washer

concentrate is spilled next to the filler neck.

Example: washer fluid reservoir

To open: pull cap : upwards by the tab.

Add the premixed washer fluid.

To close: press cap : onto the filler neck

until it engages.

Further information on windshield washer

fluid/antifreeze (Y page 349).

Brake fluid level

If you notice that the brake fluid level in

the brake fluid reservoir has fallen to the

MIN mark or less, check the brake system

immediately for leaks. Also check the

thickness of the brake linings. Visit a

qualified specialist workshop immediately.

Do not add brake fluid. This does not

correct the error.

Only check the brake fluid level when the

vehicle is on a level surface.

If the brake fluid level is between MIN

mark : and MAX mark ; on the brake fluid

reservoir, it is correct.

Maintenance

Service interval display

Service messages

Information on the type of service and service

intervals (see the separate Maintenance

Booklet).

You can obtain further information from an

authorized Mercedes-Benz Center or at

(USA only).

The ASSYST service interval display informs

you of the next service due date.

If a service due date has been exceeded, you

also hear a warning tone.

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Maintenance

Maintenance and care

Maintenance and care -> Engine compartment for Your Mercedes G Class SUV Third Generation (1990-2018)

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