[qadhi79]

like P1et said..try to get a CPO and extend your warranty/maintenance as long as you want to keep the car

I sold my ML63 AMG just because I was very very scared of the head bolt issue and could not enjoy it with a fear of it breaking down anytime

X5M is a a bulletproof machine and there are no catastrophic issues with the car..nothing major that you cant pay off your pocket without warranty and even that doesn't happen frequently

browsing the X5M/X6M forums will give you a good picture where everybody is talking about mods and accessories and not breakdowns..best of luck for the new purchase!