[BimmerGuyFL]

This was also a common problem with the E39 model 5-series. Since the E90/92 model 3-series uses an advance design of the type of suspension employed on the E39 5-series, my guess is that your control arms are going bad or that the bushings in the control arms need to be replaced. these tended to go bad on the E39 anywhere between 20K-60K miles depending on the type of driving being done.