I think eaX5 was being sarcastic... just MHO.. if he was serious, then I can recommend a nice junkyard where he can find a used brain in good shape (at least better than his)

as for the OP, I think what has been already done is pretty much exhaustive, nothing to add really! you should be in good shape for 10's of 1000's of miles! I have a 01 3.0 with 95Kmiles on the clock, and believe me, it requires minimal maintenance... it's a tank, don't be paranoid...

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BMW X5 3.0si 2008
Premium Package
Light Package
Navigation
Reverse Camera
Rear Sensor (retro-fit)
Comfort Access
Spare Wheel
Power folding mirrors
Voice Control w Bluetooth
Power trunklid

BMW X3 3.0i 2006
M Aerokit
M Sport Package
Navigation System
BT Handsfree
Xenon HID

BMW X5 3.0i 2001 --- SOLD