Within the last month our 2008 3.0 X5 with comfort seats developed squeaking sound from under the seat cushion when moving the seats/seat backs. No squeaks during driving, only when adjusting them. Brought it to our dealer, and they removed the trim, figured out that the squeak was caused by parts of the trim rubbing. They gave the trim a shave, and in under an hour I was back on the road without the squeak. That was the last week in June and the fix has held up so far.