thinking of buying an x6 this age ,what should I be concerned about ,prop shaft ,cam belts , turbo etc
OK, 11 year old German luxury SUV. What should concern you is finding a wheelbarrow large enough to carry the cash this car is going to require to own! 
Not kidding here. It isn’t the basic engine and transmission that are the going to give you issues, it is all the other options and features that break. Much of which requires a dealer to repair.
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Then stop thinking about it and concentrate on these two words ( Money Pit ) . That applies to all used European luxury vehicles.