I recently changed the rear diff fluid on my 2002 325Xi. When I changed it I didn't have the car level so I'm pretty sure that I overfilled it. Now I'm getting a leak from the Pinion Seal area. I'm not sure if my overfilling did this, and if it will stop when the fluid level gets back to normal levels. Does anyone have any experience with this? The leak is fairly small. I'm getting a 1/2inch sized circle under it when I park.