i heard the steering rubbing sound when turning right and holding the steering wheel within the angle of 3 and 6 o'clock. The sound is something like dj playing jog wheel: shhhh, shhh...
i complained to wearnes few times, they cant find the solution, lastly they found few units which have the same noise and showed me that this is normal for f30, particularly 328i sport line, totally speechless...