
Overview of the engine compartment
Example: engine
0043
Coolant expansion tank cap
(Ypage 253)
0044 DEF filler neck cap 4
(Y page 148)
0087 Engine oil filler neck cap (Y page 250)
0085 Brake fluid expansion tank cap
(Ypage 254)
0083 Washer fluid reservoir cap (Y page 255)
Regularly check the fluid level and the assem- bly 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 oper-
ation and its quality and volume are gradu- ally diminished. Regularly check the oil
level, and top up or have it replaced as nee-
ded.
Observe the information on engine oils and oil
consumption in the "Technical data" section
(Y page 322).
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 dis-
play If at extremely low temperatures no engine oil
level is displayed after 5 minutes, repeat the
engine oil level check after another
5 minutes.
If an oil level reading is still not displayed,
check the engine oil level with the dipstick
(Y page 251). Have the engine oil level
checked at a qualified specialist workshop.
Only check the oil level when the engine is at
normal operating temperature.
X Park the vehicle on a level surface.
X Switch off the engine.
X Wait 5 minutes.
X Turn the key to position 2in the ignition
lock.
The display is activated.
X Vehicles without steering wheel but-
tons: press the 0079menu button on the
instrument cluster (Y page 34) repeatedly
until the display shows the 00AFsymbol.
The --:--
--:-- display message appears in the
display while the engine oil level measure-
ment is running.
X Vehicles with steering wheel buttons:
press the 0098service button on the instru-
ment cluster (Y page 34).
The 00B2 Engine Engine oil
oillevel
level Measuring
Measuring
in progress
in progress display message appears in
the display while the engine oil level meas-
urement is in progress.
Display message for vehicles without
steering-wheel buttons: the display may
show the following messages after the engine oil level measurement. 00AF Action
OK OK X
Do not add oil. 4
For Cargo Van/Passenger Van only 250
Engine compartmentMaintenance and care

X
Replace cap 0085on the filler neck and
tighten.
When doing so, make sure that the cap
engages correctly.
X Check the oil level with the oil dipstick
(Y page 251) or on the display
(Y page 250).
X Close the hood. Coolant
G
WARNING
The engine cooling system is pressurized, par- ticularly when the engine is warm. When
opening the cap, you could be scalded by hotcoolant 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 tem-
perature must be below 122 ‡ (50 †).
! Check the engine cooling and heating sys-
tem regularly for leaks.
If a large quantity of coolant is lost, have the
cause traced and rectified at a qualified
specialist workshop. 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, eyes or clothing. In case of
contact with eyes, rinse immediately with
plenty of clean water. Clean affected areas of skin and clothing with soap and water imme-
diately. Change any affected clothing imme-
diately. G
WARNING
If antifreeze comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Let the engine cool down before you add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
! Take care not to spill any coolant on pain-
ted 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 248).
X Slowly turn cap 0043half a turn counter-
clockwise to allow excess pressure to
escape.
X Turn cap 0043further and remove it.
X Check the coolant level.
If the coolant reaches the maximum mark
on coolant expansion tank 0044, there is
enough coolant in coolant expansion
tank 0044. Engine compartment
253Maintenance and care Z

Adding coolant
X If the coolant drops under the minimum
mark on coolant expansion tank 0044, add
coolant to the maximum mark.
Observe the information on coolant mix-
ture ratio and water quality in the "Techni-
cal data" section (Y page 325). To prevent
damage to the engine cooling system, use
only approved corrosion inhibitor/anti-
freeze that comply with the Mercedes-Benz Specifications for Service Products.
X Replace cap 0043and turn it clockwise to
tighten.
X Start the engine.
X After approximately 5 minutes, switch off
the engine and allow it to cool down.
X Check the coolant level again and add cool-
ant if necessary.
X Close the hood. Brake fluid
G
WARNING
Service products may be poisonous and haz-
ardous to health. There is a risk of injury.
Comply with instructions on the use, storage
and disposal of service products on the labels of the respective original containers. Always
store service products sealed in their original containers. Always keep service products out
of the reach of children.
Brake fluid is hazardous to health. Also
observe the safety notes in the "Service prod-
ucts and capacities" section (Y page 318).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, vapor pockets 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.
! Brake fluid corrodes paint, plastic and
rubber. If paint, plastic or rubber has come into contact with brake fluid, rinse with
water immediately.
Have the brake fluid renewed every 2 years at
a qualified specialist workshop. Observe the
information on brake fluid in the "Technical
data" section (Y page 324). 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 248).
X Check the brake fluid level.
The brake fluid level is correct if the level is
between the MIN mark and MAX mark on
brake fluid reservoir 0043.
X Close the hood.
! If the brake fluid level in the brake fluid
reservoir has fallen to the MIN mark or
below, check the brake system immedi-
ately for leaks. Also check the thickness of the brake linings. Visit a qualified specialist
workshop immediately.
Do not add brake fluid. This does not cor-
rect the malfunction. 254
Engine compartmentMaintenance and care

Service products and capacities
Important safety notes
G
WARNING
Service products may be poisonous and haz-
ardous to health. There is a risk of injury.
Comply with instructions on the use, storage
and disposal of service products on the labels of the respective original containers. Always
store service products sealed in their original containers. Always keep service products out
of the reach of children. H
Environmental note
Dispose of service products in an environ-
mentally responsible manner.
Service products include the following:
R Fuels, e.g. diesel
R Additives for the exhaust gas aftertreat-
ment, e.g. Diesel Exhaust Fluid (DEF)
R Lubricants, e.g. engine oil, transmission oil
R Coolant
R Brake fluid
R Washer fluid
R Climate control system refrigerants
Approved service products comply with the
highest quality standards and are listed in the MB Specifications for Service Products. Only
use service products approved for the vehi-
cle. This is an important condition for the war-
ranty.
You will recognize the approved service prod- ucts by the inscription on the container: MB
Approval (e.g. MB Approval 228.5)
Other identifications and recommendations
refer to quality level or a specification accord-
ing to an MB Sheet Number (e.g. MB 228.5).
They are therefore not necessarily approved.
Further information can be obtained at any
qualified specialist workshop.
Additives for approved service products are
neither required nor permitted. Approved fuel additives are the exception. Additives can cause engine damage and must therefore not
be added to the service products.
The use of additives is always the responsi-
bility of the vehicle operator. The use of addi- tives may result in the restriction or loss of
your Limited Warranty entitlements. Fuel
Important safety notes G
WARNING
Fuel is highly flammable. Improper handling of fuel creates a risk of fire and explosion.
Avoid fire, open flames, smoking and creatingsparks under all circumstances. Switch off the
engine and, if applicable, the auxiliary heating before refueling. G
WARNING
Fuel is poisonous and hazardous to health.
There is a risk of injury.
You must make sure that fuel does not come into contact with your skin, eyes or clothing
and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following:
R Wash away fuel from skin immediately
using soap and water.
R If fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance with-
out delay.
R If fuel is swallowed, seek medical assis-
tance without delay. Do not induce vomit-
ing.
R Immediately change out of clothing which
has come into contact with fuel.
When handling, storing and disposing of fuels,
please observe the relevant regulations. 318
Service products and capacitiesTechnical data