Oil level check is done on the steering wheel buttons.
Do not start the engine.
Level ground
make sure the panel is showing mileage.
with the ignition on flick through the left hand buttons until you come to oil level check it will measure itself and report back through the display. OK or add x amount
If you want to know what it is in litres,
Ignition in pos 1
press reset buttons 3 times quickly
flick throu l/h steering wheel buttons til you come to display which shows oil or oel(german)
turn ign key to pos 2
the display will show amount in litres ( not sure how accurate)
switch ignition to off to reset.
Think I've got it right from memory,