Mercedes-Benz 2016 S-Class Operator's Manual page 356

Engine compartment
354
Example
Pull oil dipstick : out of the dipstick guide
X
tube.
Wipe off oil dipstick :.
X
Slowly slide oil dipstick : into the guide tube
X
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 = or
X
below, add 1.1 US qt (1.0 liter) of engine oil.