See also:

Condensation under the parked vehicle
When using the automatic climate control, condensation water develops that exits underneath the vehicle. Therefore, traces of condensed water under the vehicle are normal. ...

Active Cruise Control with Stop & Go function
Active Cruise Control with Stop & Go function - or ACC Stop&Go for short - not only maintains the desired distance to the vehicle in front, in heavy traffic it also slows the car to a stan ...

Aerodynamic optimisation of underside panelling
As the excellent drag coefficient (cd = 0.26) would suggest, the aerodynamics of the new BMW 3-Series have been intensively honed in a state-of-the-art wind tunnel. The optimised aerodynamics also ...