Perform adjustments to the control system - AR54.30-P-1000-02OPT

Check engine oil level. 

The vehicle must be horizontal for at least 5 minutes with an engine which is switched off and at operating temperature. Otherwise there may be measurement errors

1. Switch on ignition.
2. Press system selection button (S110s3) repeatedly until (A1p13) the basic display (kilometer reading or temperature display) or speed display is shown.
   Fig 1: Identifying System Selection Button, Forward/Back Button And Multifunction Display

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
3. Press scroll forward/back button (S110s1) repeatedly until "Engine oil level measurement in progress" appears in multifunction display (A1p13).
4. Engine oil level is shown in multifunction display (A1p13).
5. Correct the engine oil level if necessary and check engine oil level again.
6. Switch off ignition.