I had my X in to address the iPod dropping to FM and Rear Seat Entertainment not working right. They updated CCC computer software version to latest and greatest. Before the update, it was on 26.x something or other.

All I can say is night and day difference between how the X5 handles now. I no longer feel like it lunges or prematurely downshifts..

That software update must have made it to the Transmission ECU.

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Previous: 2002 X5 3.0 / 121,000 miles
Current: 2007 X5 3.0si / 93,000 miles