Mercedes-Benz 2013 CL Operator's Manual page 422

Engine compartment
420
Slowly slide oil dipstick : into the guide
X
tube to the stop, and take it out again.
If the level is between MIN mark = and
MAX mark ;, the oil level is correct.
If the oil level has dropped to MIN mark
X
= or below, add 1.1 US qt (1.0 liter) of
engine oil.
Checking the oil level using the on-
board computer
Measurement
Make sure that the SmartKey is in position
X
2 in the ignition lock.
Press the ; or = button to select the
X
Service menu.
Press the : or 9 button to select
X
Engine Oil Level.
Press the a button.
X
The multifunction display shows the
following message:
Oil Level Accurate Only When
Vehicle Is Level
i
If you wish to cancel the measurement,
press the % button on the multifunction
steering wheel.
Measuring Engine