X
Insert oil dipstick : back into the guide tube
as far as it will go and remove it again.
If the level is between minimum mark = and
maximum mark ;, the oil level is correct.
X
If the oil level has dropped to or below mini-
mum mark =, open cap ? and add engine oil
(
Y page 222).
The difference in quantity between marks ;
and = is approximately 2 qt (2 l).
X
Insert the oil dipstick into the guide tube as far
as it will go.
X
Close the hood (Y page 219).
OM651 4-cylinder diesel engine:
At outside temperatures between 32 ‡ (–0 †)
and 86 ‡ (30 †), the oil level can be checked
when the engine is cold.
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
Add engine oil (Y page 222)
or
X
Have engine oil siphoned off.
Adding engine oil
G
WARNING
If engine oil comes into contact with hot com-
ponents 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 com-
ponents before starting the engine.
!
The alternator is located below the engine
oil filler neck. If engine oil spills onto the alter-
nator, there is a danger of alternator 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 218).
X
Unscrew and remove cap ?.
X
Add engine oil.
X
Replace cap ? on 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 221) or on the display (Y page 220).
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 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 cool-
ant if the vehicle is on a level surface and the
engine has cooled down. The coolant tempera-
ture 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 spe-
cialist workshop.
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 painted
surfaces. You could otherwise damage the
paintwork.
222
Engine compartment
Maintenance and care
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