
Engine compartment
219
If only summer diesel fuel or less cold-resist-
ant winter diesel fuel (e.g. in Mediterranean
regions) is available, you should add an
amount of flow improver to the fuel corre-
sponding to the outside temperature.
Mix the additive with the diesel in good time,
before the flow properties of the diesel
become insufficient. Otherwise, malfunctions
can only be rectified by heating the entire fuel
system, e.g. by parking the vehicle in a heated
garage. G
Risk of fire
Do not use petrol to refuel vehicles with a
diesel engine. Never mix diesel with petrol.
This would damage the fuel system and
engine and could result in a vehicle fire.
Flow improver
The effectiveness of a flow improver is not
guaranteed with every fuel. Observe the infor-
mation provided by the manufacturer when
using a flow improver. Only use flow improv-
ers that have been tested and approved by
Mercedes-Benz. Information about flow
improvers that have been tested and
approved by Mercedes-Benz can be obtained
from any Mercedes-Benz Service Centre. Engine compartment
Bonnet
G
Risk of accident
Do not pull the release lever while the vehi-
cle is in motion. If you do so, the bonnet
may open up and block your view.
Opening G
Risk of injury
There is a risk of injury if the bonnet is open,
even if the engine is not running.
Some engine components can become
very hot.
To avoid the risk of burns, only touch those
components described in the Owner’s Man-
ual and observe the relevant safety notes. G
Risk of injury
The radiator fan between the radiator and
the engine can start automatically, even if
the key has been removed from the ignition
lock. For this reason you must not reach
into the turning area of the fan. You can
otherwise be injured. Vehicles with a petrol engine:
The electronic ignition system uses high
voltage. For this reason, you must never
touch components of the ignition system
(ignition coil, ignition cable, spark plug con-
nector or test socket) when:
R the engine is running
R the engine is being started
R the ignition is switched on and the engine
is being cranked by hand
Vehicles with a diesel engine:
The electronic injection control uses high
voltage. Therefore, never touch fuel injec-
tion system components when:
R the engine is running
R the engine is being started
R the ignition is switched on
X Make sure that the windscreen wipers are
switched off. G
Risk of injury
The windscreen wipers and wiper linkage
could be set in motion.
When the bonnet is open, you or others
could be injured by the wiper rods. Operation
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 219 ZDateiname: 6515_4293_02_buchblock.pdf; preflight 

Engine compartment
220 Make sure that the windscreen wipers are
switched off and that the key has been
pulled out of the ignition lock before open-
ing the bonnet.
The bonnet release lever is located in the
driver's footwell. 1
Bonnet release lever
X Pull bonnet release lever 1.
The bonnet is released.
! Make sure that the windscreen wipers
are not folded out away from the wind-
screen. You can otherwise damage the
windscreen wipers or the bonnet. The handle for opening the bonnet is located
above the radiator grille.
2
Bonnet catch handle
X Reach into the gap, pull bonnet catch han-
dle 2up and lift the bonnet.
Closing G
Risk of injury
Make sure that nobody can become trap-
ped as you close the bonnet.
X Lower the bonnet and let it fall from a
height of approximately 20 cm.
X Check that the bonnet has engaged prop-
erly. i
If the bonnet can be raised slightly, it is
not properly engaged. Open it again and
close it with a little more force. Engine oil
Depending on driving style, the vehicle con-
sumes a maximum of 0.8 l oil per 1,000 km.
The oil consumption may be higher than this
when the vehicle is new or if you frequently
drive at high engine speeds. You can only
estimate the oil consumption after you have
driven a considerable distance.
You will find further information about engine
oil in the "Technical data" section
(Y page 369).
Checking the engine oil level To do so:
R
the vehicle should be parked on level
ground.
R the engine should be switched off for at
least five minutes if the engine was at nor-
mal operating temperature.
R the engine should be switched off for at
least 30 minutes if the engine was not at Operation
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 220Dateiname: 6515_4293_02_buchblock.pdf; preflight 

Engine compartment
221
operating temperature (i.e. if you only star-
ted the engine briefly).
Via the on-board computer*
i Only possible on the ML 420 CDI. On all
other models a dipstick is used to check
the engine oil level (Y page 222).
X Make sure that the key is in position
2(Y page 75) in the ignition lock.
X Press the jork button to select the
following message: The measurement takes a few seconds. You
will see one of the following messages in the
display:
R
Engine oil level OK
R Add 1.0 litre to reach maximum oil
level R
Add 1.5 litres to reach maximum oil
level
R Add 2.0 litres to reach maximum oil
level
X Top up the oil if necessary ( Ypage 222).
Other messages in the multi-function dis-
play
If the engine is at normal operating tempera-
ture and there is too much oil, you will see the
following message:
Eng. oil level
Reduce oil level
X Have excess oil siphoned off.
! There is a risk of damage to the engine or
the catalytic converter if there is excess oil
in the engine.
If the Switch ignition on to check
engine oil level message appears:
X Turn the key to position 2(Y page 75) in
the ignition lock.
You will see the following message if you did
not observe the required waiting period:
Observe waiting period X
Repeat the measurement after about five
minutes if the engine is at normal operating
temperature.
X Repeat the measurement after about
30 minutes if the engine is not at normal
operating temperature (if the engine was
only started briefly).
The following message appears if the engine
is running:
Engine oil level Not when engine on
X Switch off the engine and wait for five
minutes if the engine is at normal operating
temperature, or for about 30 minutes if the
engine is not at normal operating temper-
ature (if the engine was only started
briefly), before measuring.
i If you wish to cancel the measurement,
press the korj button on the multi-
function steering wheel. Operation
* optional
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 221 ZDateiname: 6515_4293_02_buchblock.pdf; preflight 

Engine compartment
222
Using the oil dipstick
Example: vehicles with a petrol engine
1
Oil dipstick
2 Maximum mark
3 Minimum mark
X Pull oil dipstick 1out of the oil dipstick
tube.
X Wipe off oil dipstick 1.
X Insert oil dipstick 1into the oil dipstick
tube to the stop, and take it out again.
The oil level is correct if the level is between
minimum mark 3and maximum mark
2.
X Top up the oil if necessary. i
The difference in quantity between mini-
mum mark 3and maximum mark 2is
approximately 2 litres.
Topping up the engine oil Example: 8-cylinder engine vehicles
1
Cap Example: 6-cylinder engine vehicles
1
Cap
X Unscrew cap 1and remove it.
X Top up with the amount of oil required.
! Do not add too much oil. If too much oil
is added and the oil level is above the max-
imum mark on the dipstick, the engine or
catalytic converter could be damaged.
Have excess oil siphoned off.
X Screw cap 1onto the filler neck. H
Environmental note
When topping up the oil, take care not to
spill any. Oil must not be allowed to escape
into the soil or waterways. You would oth-
erwise be damaging the environment. Operation
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 222Dateiname: 6515_4293_02_buchblock.pdf; preflight 

Tyres and wheels
225
lidates the General Operating Permit for the
vehicle.
Notes on selecting, fitting and replacing
tyres
R
Only fit tyres and wheels of the same type
and make.
R Only fit tyres of the correct size onto the
wheels.
R After fitting new tyres, run them in at mod-
erate speeds for the first 100 km as they
only reach their full performance after this
distance.
R Fit new tyres on the front wheels first if
tyres of the same size are required on the
front and rear wheels.
R Replace the tyres after six years at the lat-
est, regardless of wear. This also applies to
the spare wheel*.
R Do not drive with tyres which have too little
tread depth as this significantly reduces
the traction on wet roads (aquaplaning).
! Store tyres that are not being used in a
cool, dry and preferably dark place. Protect
the tyres against oil, grease, petrol and die-
sel. Notes on regularly inspecting wheels
and tyres R
Regularly check the wheels and tyres of
your vehicle for damage (e.g. cuts, punctu-
res, tears, bumps on tyres and deforma-
tion, cracks or severe corrosion on wheels),
at least every 14 days, as well as after driv-
ing off-road or on rough roads. Damaged
wheels could cause a loss of tyre pressure.
R Regularly check the tyre tread depth and
the condition of the tread across the whole
width of the tyre (Y page 226). If neces-
sary, turn the front wheels to full lock in
order to inspect the inner side of the tyre
surface.
R All wheels must have a valve cap to protect
the valve against dirt and moisture.
R Regularly check the pressure of all your
tyres including the spare tyre*, particularly
prior to long trips, and correct the pressure
as necessary (Y page 226).
Notes on driving R
While driving, pay attention to vibrations,
noises and unusual handling characteris-
tics, e.g. pulling to one side. This may indi-
cate that the wheels or tyres are damaged.
If you suspect that a tyre is defective, reduce your speed and stop the vehicle as
soon as possible to check the wheels and
tyres for damage. Hidden tyre damage
could also be causing the unusual handling
characteristics. If you find no signs of dam-
age, have the wheels and tyres examined
at a specialist workshop, for example at a
Mercedes-Benz Service Centre.
R When parking your vehicle, make sure that
the tyres do not get deformed by the kerb
or other obstacles. If it is necessary to drive
over kerbs, speed humps or similar, try to
do so slowly and at an obtuse angle. Oth-
erwise, the tyres, particularly the sidewalls,
could get damaged. Direction of rotation
Direction of rotation Tyres with a specified direction of rotation
have additional benefits, e.g. if there is a risk
of aquaplaning. You will only gain these ben-
efits if the correct direction of rotation is
observed.
An arrow on the sidewall of the tyre indicates
its correct direction of rotation. Operation
* optional
164_AKB; 5; 5, en-GB
wobuchh
,V ersion: 2.10.6
2008-05-11T11:55:12+02:00 - Seite 225 ZDateiname: 6515_4293_02_buchblock.pdf; preflight 

Off-road driving
236
R
Check that items of luggage and loads are
stowed safely and are well secured
(Y page 193).
R Always keep the engine running and in gear
when driving on a downhill gradient. Acti-
vate DSR.
R Drive slowly and evenly, if necessary at a
walking pace.
R Ensure that the wheels are in contact with
the ground at all times.
R Drive with extreme care on unknown off-
road routes where visibility is poor. For
safety reasons, get out of the vehicle first
and survey the off-road route.
R Check the depth of water before fording
rivers and streams.
R Look out for obstacles such as rocks, holes,
tree stumps and furrows.
R Always keep the side windows and the slid-
ing /tilting sunroof* closed during the jour-
ney.
R Do not stray from marked routes or paths.
i Information about retrofitting special all-
terrain tyres is available from any
Mercedes-Benz Service Centre. Checklist before driving off-road X
Engine oil level: check the engine oil and
top it up if necessary.
X Vehicle toolkit: check that the jack is
working and make sure you have the wheel-
brace, a robust tow cable and a folding
spade in the vehicle.
X Wheels and tyres: check the tyre tread
depth and tyre pressure.
X Check for damage and remove foreign
objects, e.g. small stones, from the
wheels/tyres.
X Replace any missing valve caps.
X Replace dented or damaged wheels.
Checklist after driving off-road Driving over rough terrain places greater
demands on your vehicle than driving on nor-
mal roads. After driving off-road, check the
vehicle. This allows you to detect damage
promptly and reduce the risk of an accident
to yourself and other road users.
X
Deactivate the LOW RANGE* off-road gear
(Y page 141).
X Deactivate DSR (Y page 139).
X Set the differential lock setting to AUTO on
the selector wheel (Y page 143). X
Lower the vehicle level* again to a level
suitable to the road conditions, e.g. to the
highway/high-speed level.*
X Clean the headlamps and rear lights and
check for damage.
X Clean the front and rear licence plates.
X Clean the wheels/tyres with a water jet and
remove any foreign objects.
X Clean the wheels, wheel arches and the
vehicle underside with a water jet; check
for foreign objects and damage.
X Check whether twigs or other parts of
plants have become trapped. These
increase the risk of fire and can damage
fuel pipes, brake hoses or the rubber bel-
lows of the axle joints and propeller shafts.
X After the trip, examine without fail the
entire undercarriage, wheels, tyres, brakes,
bodywork structure, steering, chassis and
exhaust system for damage.
X After driving for extended periods across
sand, mud, gravel, water or in similarly dirty
conditions, have the brake discs, wheels,
brake pads /linings and axle joints checked
and cleaned.
X If you detect strong vibrations after off-road
travel, check for foreign objects in the
wheels and drive train and remove them if Operation
* optional
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 236Dateiname: 6515_4293_02_buchblock.pdf; preflight 

Care
247Exceeding the service due date
One of the following messages appears in the
multi-function display:
Service A .. days overdue
Service A overdue by .. km
You will also hear a warning tone.
A qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre, will reset the
ASSYST PLUS service interval indicator after
the necessary service work has been carried
out.
i If you fail to have the service performed
by the specified date, you may be violating
applicable laws. Your warranty may be inva-
lidated and goodwill settlements may be
refused. Calling up the service due date
Use the buttons on the multi-function steer-
ing wheel.
X Switch on the ignition.
X Press èorÿ to select the Basic
display menu (Y page 120).
X Press the jork button to select the
service information.
The 9 service symbol and the service
due date are displayed. Care
Notes on care
Regular and proper care maintains the value
of your vehicle.
i It is advisable to use Mercedes-Benz care
products.
Scratches, corrosive deposits, areas affected
by corrosion and damage caused by inade-
quate care cannot always be completely
repaired. In such cases, visit a qualified spe-
cialist workshop immediately, e.g. a
Mercedes-Benz Service Centre.
Repair damage caused by loose chippings
and remove the following substances imme-
diately, whilst avoiding rubbing too hard:
R Soak insect remains with insect remover
and rinse off afterwards.
R Soak bird droppings with water and rinse
off afterwards.
R Remove tree resin, oils, fuels and greases
by rubbing gently with a cloth soaked in
petroleum ether or lighter fluid.
R Use silicone remover to remove wax.
R Use tar remover to remove tar stains. Operation
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 247 ZDateiname: 6515_4293_02_buchblock.pdf; preflight 

Care
250
!
Only use washer fluid which is suitable
for plastic lenses. Unsuitable washer fluid
could damage the plastic lenses of the
headlamps.
Do not use the following:
R dry cloths
R abrasive cleaning agents
R solvents
R cleaning agents containing solvent
You could otherwise scratch or damage the
surface of the lenses.
Cleaning the plastic cover !
Do not use dry, coarse or hard cloths and
do not scrub. Doing so will scratch or dam-
age the surfaces.
! In order to protect the vehicle's high qual-
ity surfaces and to retain the overall
appearance, avoid contact with cosmetics
and suntan lotion. X
Wipe plastic parts with a damp, lint-free
cloth (e.g. a microfibre cloth).
X Light soiling: use a low-foaming soap (e.g.
a light liquid hand soap) diluted in water.
X Heavy soiling: use a cleaning agent that is
solvent-free and non-corrosive. Mercedes-
Benz recommends that you use a
Mercedes-Benz cleaning product for this
purpose.
Cleaning the steering wheel boss and
dashboard X
Moisten a clean lint-free cloth with water.
X Clean the plastic parts and the dashboard.
X If particularly dirty, use a mild detergent. G
Risk of injury
Do not use cleaners and cockpit care
sprays containing solvents to clean the
cockpit and steering wheel boss. Cleaners
containing solvents cause the surface to
become porous and in the event of an air-
bag being triggered, plastic parts that have
become loose could cause considerable
injuries. Cleaning the leather upholstery* !
Cleaning
R Clean genuine leather covers using a
damp cloth, then wipe the covers down
using a dry cloth. When doing this, make
sure that the leather does not become
soaked. For leather care, you should use
leather care foam A 001 986 59 71 10.
You can purchase this from any
Mercedes-Benz Service Centre.
R Clean artificial leather covers with a cloth
moistened with a solution containing 1%
detergent (e. g. washing-up liquid).
R Clean fabric covers with a microfibre
cloth moistened with a solution contain-
ing 1% detergent (e. g. washing-up liquid).
When cleaning, take care not to rub too
vigorously and always wipe entire seat
sections to avoid leaving visible lines.
Leave the seat to dry afterwards. Clean-
ing results depend on the type of dirt and
how long it has been there.
R Clean Alcantara covers with a damp
cloth. Make sure you wipe entire seat
sections to avoid leaving visible lines.
i Note that leather covers are a natural
product and as such are subject to a natural Operation
* optional
164_AKB; 5; 5, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T11:55:12+02:00 - Seite 250Dateiname: 6515_4293_02_buchblock.pdf; preflight