My mechanic noticed this leak at my last oil change - it seems to be the same issue described in these threads: http://www.e90post.com/forums/showthread.php?t=804568&highlight=front diff leak http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2576277 Unfortunately my car is now out of warranty despite it's extremely low 23000 mileage. I don't have a jack so I couldn't get a nice picture from under the car, but I did manage to get some shots from inside the wheel wells. You can see how the left side kinda looks wet compared to the right side which is nice and dry. Local BMW-only indy shop quoted the repair at $300 total. I think it's just part #6 on this diagram I need? http://www.realoem.com/bmw/showparts.do?model=VC93&mospid=49549&btnr=31_0718&hg=31&fg=15 The actual part itself is really cheap but it seems like a real task getting to it. How bad do you guys think this looks? Neither of the auto shops I spoke to seemed particularly concerned about it. I've been thinking about simply topping off the differential fluid and seeing if I can hold out until Inspection I to take care of it. Is this a particularly pesky issue with xDrive models?