See also:

Enabling operation in the rear
Only possible via the iDrive in the front. 1. "Settings" 2. "Allow rear control" 3. Select the desired priority. ...

Remove attached partsfollowing use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

Safety
Besides options like lane departure warning, the 5 Series comes equipped with a suite of side curtain airbags and front-seat side-impact airbags. Rear seat-mounted airbags can be ordered as a $385 ...