I am having the same leaking issue on my 2001 X5 3.0i. It's a 9 hours job which is the minimum hours a repair shop bills the warranty company. Dealer could bill you 15 hours about $2000. I sent the truck in today and I looked at the oil pan when the truck was on the lift. The leaking oil was all over; and it seems not to be an easy job if you don't have a lift. I had the experience to fix my 4.6is valve gasket leaking. It was a hard job. This one seems even harder as you have to perform all work under the truck. I negotiated with my repair shop; I'll pay $1100 total. For 3.0i I was told that they have to lower the frame, a lot of disassembly work. The gasket only cost about $30. All labor cost. They told me by this chance they will change the axle seals on both side, about $15 each. My understand they will take down the frame, or something around the frame. But it doesn't need to do the alignment after the job is done.