See also:

xDrive
xDrive is the all-wheel-drive system of your vehicle. The combined effects of xDrive and DSC further optimize the traction and dynamic driving characteristics. The 4-wheel drive system xDrive v ...

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 ...

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. ...