Talked to my SA just now about the Tire Warranty--you can put anything on there as long as it's not some weird off-brand or if you mod it. He said Bridgestone's and Dunlop's are OEM so those are covered and you can even do Michelin, Continental, etc.

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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