Help pinpoint the noise
I have a 2000 M5 and it has recently begun making an oscillating/whirring noise. It's more of a whine than a squeak. It comes and goes, but once it starts, it usually doesn't stop while I'm underway. The oscillation frequency doesn't seem to increase or get louder as the speed of the vehicle or RPMs increases or decreases. It generally seems to stop just before the vehicle comes to a stop. The wife and I can't pinpoint where it is originating from, but my best guess is that it's not from the engine compartment, more likely from underneath somewhere.