Mercedes-Benz S-Class Coupe 2015 Operator's Manual page 322

Engine compartment
320
Example
Pull oil dipstick : out of the dipstick guide
X
tube.
Wipe off oil dipstick :.
X
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.