Mercedes-Benz 2004 CLK-Class Cabriolets Operator's Manual page 290

Operation
Engine compartment
Other display messages
If the SmartKey is not turned to position 2
in the starter switch, the following
message will appear:
Turn on ignition
to see engine oil level!
Switch on the ignition.
If you see the message:
Observe waiting time
If engine is at normal operating
temperature, wait five minutes before
repeating check procedure.
If engine is not yet at normal operating
temperature, wait 30 minutes before
repeating check procedure.
290
If you see the message:
Engine oil level
Not when engine on!
Turn off the engine.
If the engine is at normal operating
temperature, wait five minutes before
checking oil.
If the engine is not yet at normal
operating temperature, you must wait
30 minutes before checking oil.
If there is excess engine oil with the engine
at normal operating temperature, the
following message will appear:
Engine oil level
Reduce oil level !
Have excess oil siphoned or drained
off. Contact your authorized
Mercedes-Benz Center.
!
Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.
More information on messages in the
display concerning engine oil can be found
in the "Practical hints" section
( page 332).