Took mine in yesterday morning for it. I got the dreaded call in the afternoon about the nationwide backorder on the part--he said the earliest they would get the part would be Thursday. And he said it takes about 3 days for it be completed (apparently, they have to lift the engine out to do it). So, I'm guessing it won't be ready until next week sometime. My loaner is an '13 328--though they said I can check back at end of each day to swap out for something bigger like a 5, X5, etc (or maybe a 7 Series--I got one of those for like 2 weeks as they didn't have anything else--had it for like a week).

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film