See also:

Remove attached parts following 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. ...

BMW Maintenance System
The maintenance system directs you to required maintenance measures and thereby supports you in maintaining road safety and the operational reliability of the vehicle. ...

Vehicle Overview
BMW calls the 2006 version of its flagship 7 Series sedan a midsize freshening rather than a redesign. Launched as a 2002 model, the current-generation rear-wheel-drive 7 Series has been available ...