Additional weight increases fuel consumption.
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.
Close the windows and glass sunroof
Driving with the glass sunroof and windows open results in increased air resistance and thereby reduces the range.
BMW X3 Service & Repair Manual > Transmission: Automatic transmission fluid for zf-transmission
GA8HP45Z / GA8HP50Z / GA8HP70Z / GA8HP90Z / GA8P70H / GA8P75H /
GA8HP75Z
14.0 AUTOMATIC TRANSMISSION FLUID FOR ZF-TRANSMISSION
GA8HP45Z / GA8HP50Z / GA8HP70Z / GA8HP90Z / GA8P70H / GA8P75H /
GA8HP75Z
NOTE:
The automatic transmissions have a life-time oil filling. These transmissions
require no oil change for their entire service life.
The approved lifetime fluid ...