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. ...

Tire inflation pressures X5 xDrive35i/X5 xDrive35d with two rows of seats
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Side airbags
In a lateral impact, the side airbag supports the side of the body in the chest and lap area. ...