Rear differential bolt failure: Failure has not happened yet, but will happen eventually with enough mileage as seen with many other BMW X3M vehicles. Problem is with the rear differential bolt. The bolt is prone to shearing or snapping, noises may be heard from differential up until failure occurs at some point. Once this occurs it can wreak havoc on the differential and associated parts and cause thousands of dollars worth of damage if you are outside of the warranty period. The bolt needs to be stronger or something needs to be added to the bolt area to lessen the movement of the differential under power. If bolt is to snap on the road this will cause safety issues as you will lose power and potentially break many things on vehicle that could cause road debris and also require you to pull over immediately. Problem can't be reproduced as it's a single bolt that can fail at any time. No inspections have taken place, no warning lights or problems before hand. However, some may hear noises in the rear differential under power.

- Northville, MI, USA