I did a quick search and figured this would be the best place to put this. I'm wondering, for those who have 150K+ miles on their E53, what sort of problems have you run into (if any)? There are two different X5s locally that I'm interested in, one is 148K and the other is 178K, but I want a good idea of what I'm getting into before buying. I mean, to me, 178K is a LOT of miles, and it's not a vehicle I'll be keeping forever (I'm one that likes to switch / upgrade every couple years). I would probably be putting 10-15K on it per year. However, the 178K car is a one owner and it's been very well taken care of.