I do notice there are different kinds of sound, every time after driving and parked car, but I have to be close to the car and listen intentionally. I thought that's maybe from some mechanic, or some pumps, to finish the things up. So this matches what ART-qitec said about 'spoken with numerous BMW mechanics about sound shouldn't be audible' and what mart_dev mentioned compressor is acting everyday.


My air springs are not leaking too fast to drug the compressor to death too soon, so I guess I can wait for Xmas time to see if Arnotts would be on sale