Page 241 of 334
Useful information
............................240
Engine compartment ........................240
Vehicle interior ................................. 248
Maintenance ...................................... 248
Battery ............................................... 250
Care .................................................... 255 239Maintenance and care
Page 242 of 334

Useful information
This Operator's Manual describes all models
as well as standard and optional equipment
of your vehicle that were available at the time
of going to print. Country-specific variations
are possible. Note that your vehicle may not
be equipped with all of the described
functions. This also applies to systems and
functions relevant to safety.
Read the information on qualified specialist
workshops (Y page 26). Engine compartment
Hood
Opening the hood G
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. G
WARNING
Opening the hood when the engine is
overheated or when there is a fire in the
engine compartmen tcould 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. G
WARNING
Certain components in the engine
compartment, such as the engine, radiator
and parts of the exhaust system, can become
very hot. Working in the engine compartment
poses a risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following. G
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,
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R keep clothing away from moving parts G
WARNING
The fuel injection system operates with a high
voltage. If you touch the live components, you
could receive an electric shock. There is a risk
of injury.
Never touch components of the fuel injection
system when the ignition is switched on.
The live components of the fuel injection
system are, for example, the injectors.
! Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield
wipers or the hood. Hood release lever in the driver's footwell
X
Stop your vehicle as far away from traffic
as possible on level ground.
X Switch off the engine. 240
Engine compartmentMaintenance and care
Page 243 of 334

X
Secure the vehicle to prevent it from rolling
away.
X Pull release handle 0005on the hood.
The hood is released. X
Reach into the gap and push grip 0006on the
hood catch upwards. X
Swing the hood upwards unti lsuppor tstrut
0026 engages and the hood is supported.
Closing the hood G
WARNING
If the hood is unlatched, it could tip forward
during rapid deceleratio nofthe vehicle and
hit persons or objects within its path. There is
a risk of an accident and injury.
Therefore, always make sure that the hood is
closed and locked completely before driving
off. If the hood is not locked and you are already
driving at walking pace:
R
the yellow 0004indicator lamp in the
instrumentc luster goes on for vehicles
without steering-wheel buttons.
R the 0004 Hood open display appears for
vehicles with steering-wheel buttons.
! When you press the support strut back,
make sure that you do not press it against
the detent position and cause it to bend.
! Do not use your hands to push the hood
down. You could damage it otherwise.
X Lift the hood slightly.
X Press support strut 0026towards the back.
X Lower the hood and allow it to fall with
momentum fro maheight of approximately
1 ft (30 cm).
The hood locks audibly.
X Check that the hood is correctly locked.
If the hood can be raised slightly, it is not
properly engaged.
i If the hood is not correctly engaged, open
the hood again. Let the hood fall with a little
more momentum. Overview of the engine compartment
0005
Coolant expansion tank cap
(Ypage 244)
0006 Diesel Exhaust Fluid (DEF) filler neck
cap 3
(Y page 143)
0026 Engine oil filler neck cap (Y page 242)
3 Only on Cargo Vans/Passenger Vans. Engine compartment
241Maintenance and care Z
Page 244 of 334

0025
Brake fluid expansion tank cap
(Ypage 245)
0023 Washe rfluid reservoir cap (Y page 246)
Regularly chec kthe fluid level and the
assembly for leaks. If you detect fluid loss,
e.g. oil flecks on the vehicle parking space,
consult a qualified specialist workshop
immediately. Engine oil
General notes !
Engine oil gets dirty in the course of
operation and its quality and volume are
gradually diminished. Regularly check the
oil level, and top up or have it replaced as
needed.
Observe the information on engine oils and oil
consumption in the "Technical data" section
(Y page 321).
You can check the oil level in the engine:
R on the display of the on-board computer
R with the oil dipstick
Checking the oil level shown in the
display If at extremely low temperatures no engine oil
level is displayed after
5minutes, repeat the
engine oil level chec kafter another
5 minutes.
If an oil level reading is still not displayed,
check the engine oil level with the dipstick.
Have the oil level display checked at a
qualified specialist workshop.
Only check the oil leve lwhen the engine is at
normal operating temperature.
X Park the vehicle on a level surface.
X Switch off the engine.
X Wait for five minutes.
X Turn the key to position 2in the ignition
lock.
The display is activated. X
Vehicles without steering wheel
buttons: press the 0004menu button on the
instrument cluster (Y page 33) repeatedly
until the display shows the 0015symbol.
The --:-- display message appears in the
display while the engine oil level
measurement is running.
X Vehicles with steering wheel buttons:
press the 0012service button on the
instrument cluster (Y page 33).
The 001DEngine oil level Measuring
in progress display message appears in
the display while the engine oil level
measurement is in progress.
Display message for vehiclesw ithout
steering-wheel buttons: the display may
show the following messages afte rthe engine
oil level measurement. 0015
Action
OK X
Do not add oil. – 1.0 qts X
Add the amount of oil
shown (Y page 244).
X Check the engine oil level
again after a few minutes. – 1.5 qts
– 2.0 qts
HI The oil level is too high.
X
Have excess oil removed. Measurement units in the display:
R
qts USA only
R ltr Canada only
Display message for vehiclesw ith
steering-wheel buttons: the display may
show the following messages afte rthe engine
oil level measurement. 0015
Action
Engine
oil level
OK X
Do not add oil. 242
Engine compartmentMaintenance and care
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Engine
oil Add
1.0quart X
Add the amount of oil
shown (Y page 244).
X Check the engine oil level
againa fter a few minutes. Engine
oil Add
1.5quart
Engine
oil Add
2.0quart
Engine
oil level
Reduce
oil level The oil level is too high.
X
Have excess oil removed. Eng. oil
lev. Turn
ignition
on for
level X
Turn the key to
position 2in the ignition
lock. Observe
wait.
period X
Repeat the engine oil
measurement after about
5 minutes if the engine is
at normal operating
temperature.
X Repeat the engine oil
measurement after about
30 minutes if the engine
is not at normal operating
temperature. Engine
oil level
Not when
eng.
running X
Switch off the engine and
wait for approximately
5 minutes if the engine is
at normal operating
temperature. Then,
perform the engine oil
measurement. Measurement units in the display:
R
qts USA only
R ltr Canada only Checking the oil level using the oil
dipstick
For vehicles with a red oil dipstick, only check
the oil level whe
nthe engine is at normal
operating temperature:
X Stop your vehicle as far away from traffic
as possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Switch off the engine.
X Wait for five minutes.
For vehicles with a yellow oil dipstick, only
check the oil level when the engine is cold.
X Stop your vehicle as far away from traffic
as possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 240).
X Pull out oil dipstick 0005.
X Wipe oil dipstick 0005using a lint-free cloth. Engine compartment
243Maintenance and care Z
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X
Insert oil dipstick 0005back into the guide
tube as far as it will go and remove it again.
If the level is between minimum mark 0026
and maximum mark 0006, the oil level is
correct.
X If the oil level has droppe dto or below
minimum mark 0026, open cap0025and add
engine oil (Y page 244).
The difference in quantity between
marks 0006and 0026is approximately
2 US quarts (2 l).
X Close the hood.
OM651 4-cylinder diesel engine:
At outside temperatures between 32 ‡
(–0 †) and 86 ‡(30 †) you can measure the
oil level whe ncold.
Measuring the engine oil when the engine is
cold is less precise than measuring when the
engine is at normal operating temperature.
When the appropriate warning is shown in the
display
X Adding engine oil (Y page 244)
Or
X Have engine oil siphoned off.
Adding engine oil G
WARNING
If engine oil comes into contact with hot
components in the engine compartment, it
may ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next
to the filler neck. Let the engine cool down
and thoroughly clean the engine oil off the
components before starting the engine.
! The alternator is located below the engine
oil filler neck.Ife ngine oil spills onto the
alternator, there is a dange rofalternator
damage. Be very careful when adding
engine oil. H
Environmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful
to the environment.
! 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.
! Do not use any additives in the engine oil.
This could damage the engine.
X Open the hood (Y page 240).
X Unscrew and remove cap 0025.
X Add engine oil.
X Place cap 0005on the filler nec kand tighten.
Whe ndoing so, make sure that the cap
engages correctly.
X Check the oil level with the oil dipstick
(Y page 243) or on the display
(Y page 242).
X Close the hood. Coolant
G
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.
Only check the coolant level and/or fill the
coolant if the vehicle is on a level surface and
the engine has cooled down. The coolant
temperature must be below 122 ‡ (50 †).
! Check the engine cooling and heating
system regularly for leaks.
If a large quantity of coolant is lost, have
the cause traced and rectified at a qualified
specialist workshop. 244
Engine compartmentMaintenance and care
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G
WARNING
Coolant contains glycol and is therefore toxic.
Do not swallow the coolant. See a doctor
immediately if you swallow coolant.
Make sure that coolant does not come into
contact with skin, eyesorc lothing. In case of
contac twith eyes, rinse immediately with
plenty of clean water .Clean affected areas of
skin and clothing with soap and water
immediately. Change any affected clothing
immediately. G
WARNING
If antifreeze comes into contact with hot
components in the engine compartment, it
may ignite. There is a risk of fire and injury.
Let the engine cool down before you add
antifreeze. Make sure that antifreeze is not
spilled nex tto the filler neck.T horoughly
clean the antifreeze from components before
starting the engine.
! Take care not to spill any coolant on
painted surfaces. You could otherwise
damage the paintwork. Example: cap and coolant expansion tank
Checking the coolant level
X
Stop your vehicle as far away from traffic
as possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 240). X
Slowly turn cap 0005half a turn counter-
clockwise to allow excess pressure to
escape.
X Turn cap 0005further and remove it.
X Check the coolant level.
If the coolant reaches the maximum mark
on coolant expansion tank 0006, there is
enough coolant in coolant expansion
tank 0006.
Adding coolant
X If the coolant drops under the minimum
mark on coolant expansion tank 0006, add
coolant to the maximum mark.
Observe the information on coolant
mixture ratio and water quality in the
"Technical data" section (Y page 324). To
prevent damage to the engine cooling
system, use only approved corrosion
inhibitor/antifreeze that comply with the
Mercedes-Benz Specifications for Service
Products.
X Replace cap 0005and turn it clockwise to
tighten.
X Start the engine.
X After approximately 5minutes, switch off
the engine and allow it to cool down.
X Check the coolan tlevel again and add
coolant if necessary.
X Close the hood. Brake fluid
G
WARNING
Brake fluid is hazardous to health. Do not
swallow brake fluid. See adoctor immediately
if you swallow brake fluid.
Make sure that brake fluid does not come into
contact with skin, clothing or eyes. Rinse
affected areas with plenty of clean water and
consult a doctor if necessary.
Always wear gloves and eye protection when
topping up brake fluid. Engine compartment
245Maintenance and care
Z
Page 248 of 334

Store brake fluid only in the original closed
container and keep it out of the reach of
children. Comply with safety regulations
when handling brake fluid.
! Brake fluid corrodes paint, plastic and
rubber .Ifpaint, plastic or rubbe rhas come
into contact with brake fluid, rinse with
wate rimmediately. G
WARNING
The brake fluid constantly absorbs moisture
from the air. This lowers the boiling point of
the brake fluid. If the boiling point of the brake
fluid is too low, vapo rpockets may form in the
brake system when the brakes are applied
hard. This would impair braking efficiency.
There is a risk of an accident.
You should have the brake fluid renewed at
the specified intervals.
! If the brake fluid level in the brake fluid
reservoir has fallen to the MIN mark or
below, 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 malfunction.
Have the brake fluid renewed every two
years.
Observe the information on brake fluid in the
"Technical data" section ( Ypage 245). Check the brake fluid level regularly, e.g.
weekly or when refueling. Checking the brake fluid level
X
Stop your vehicle as far away from traffic
as possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 240).
X Check the brake fluid level.
The brake fluid level is correc tifthe level is
between the MIN mark and MAX mark on
brake fluid reservoir 0005.
X Close the hood. Washer fluid
G
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.
! Only use washer fluid that is suitable for
plastic lamp lenses, e.g. MB SummerFit or
MB WinterFit. Unsuitable washer fluid
could damage the plastic lenses of the
headlamps. Example: washer fluid reservoir
Add windshield washer concentrate to the
washer fluid all year round. Observe the
information on washer fluid in the "Technical
data" section (Y
page 326).246
Engine compartmentMaintenance and care