See also:

Activating the rear view camera
Make sure that the SmartKey is in position 2 in the ignition lock. Engage reverse gear. The area behind the vehicle is shown in the COMAND display with guide lines. ...

Replacing the rear window wiper blade
Removing the wiper blade Removing the wiper blade Remove the SmartKey from the ignition lock. Fold wiper arm 1 away from the rear window until it engages. Position wiper blade 2 at a righ ...

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