See also:

Guide lines in the COMAND display
WARNING   Use of rear view camera can be dangerous if you are color-blind or have impaired color vision. Only use rear view camera if you can see and distinguish all colored guidelines ...

Additives
Do not use any additives in the engine oil. This could damage the engine. ...

Cleaning the display
  Before cleaning the display, make sure that it is switched off and has cooled down.   Clean the display surface using a commercially-available microfiber cloth and TFT/LCD display c ...