Mercedes-Benz GLK-Class Operator's Manual page 304

Engine compartment
302
Damage to the engine or exhaust system is
caused by the following:
using engine oils and oil filters that have
R
not been specifically approved for the
service system
replacing engine oil and oil filters after
R
the interval for replacement specified by
the service system has been exceeded
using engine oil additives.
R
! 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
X
it.
Add engine oil.
X
If the oil level is at or below the MIN mark
on the oil dipstick, add 1.1 US qt (1.0 liter)
of engine oil.
Replace cap : on the filler neck and turn
X
clockwise.
Ensure that the cap locks into place
securely.
Check the oil level again with the oil
X
dipstick ( page 301).
Y
Further information on engine oil
( page 369).
Y
Checking and adding other service
products
Checking coolant level
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 when the vehicle
is on a level surface and the engine has cooled
down.
Turn the SmartKey to position 2 in the
X
ignition lock ( page 141).
Y
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (
Check the coolant temperature display in
X
the instrument cluster.
The coolant temperature must be below
158 ‡ (70 †).
Slowly turn cap : half a turn counter-
X
clockwise and allow excess pressure to
escape.
Turn cap : further counter-clockwise and
X
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 ;.
page 141).
Y