Knock on wood, both of mine are set, no issues, no need to fix anything. The 4.8is has a new upper windshield seal in a box waiting for me to find time, but that is it. I recently installed new brakes all around incl. new rotors.

Contemplating selling both for a X5M or 50i, unsure at this time. Reading about a host of issues with the N63 also. Gheesh BMW, I am not asking you to build a Lexus reliable car, but how about testing out new drive-trains before releasing into the wild.

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E53 X5 4.8is-Dinan S2-Street Brawler
E70 X5M-The stoplight shocker
AMG E55K-539 RWHP, 629RWTQ-my toy
GX470-the unbreakable truck.
F30 328i-JB4 STG 2. Daily MPG Work Beater
02-WS6, 6sp my other toy
...other stuff parked around here somewhere