BMW 5 Series: Remove attached parts 
following use - Saving fuel - Driving tips - BMW 5 Series Owners ManualsBMW 5 Series: 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.

    Remove unnecessary cargo
    Additional weight increases fuel consumption. ...

    Close the windows and glass sunroof
    Driving with the glass sunroof and windows open results in increased air resistance and raises fuel consumption. ...

    See also:

    Horn
    To sound the horn, press on or close to the mark. ■After adjusting the steering wheel Make sure that the steering wheel is securely locked. The horn may not sound if the steering wheel i ...

    Shuffle playback
    Pressing (RDM) changes modes in the following order: Track shuffle → Album shuffle → Off. ...

    Engine Oil Additives
    Your vehicle does not require any oil additives. Additives may adversely affect the engine or transmission performance and durability. ...