Valve stem seal issues, and sometimes the guides wear out as well. We've had a few cars that got seals done, and were worn out again in less than 10k miles. Had to send the heads to the machine shop for new valve guides. Also the rear main seals and the rear end coolant covers tend to leak. Requires the transmission and flywheel to be removed (AGA sells an updated coolant rear end cover to stop the oil leaking from the oil galley plug on the back of the block). The coolant vent pipe between the cylinder heads leak. Cheap part, but about 4 hours labor at a shop because the alternator has to come out. Upper oil pans leak. Your car is x-drive, so I'd guess 15+ hours labor.
ASE and BMW Master Certified Technician
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