 I recently bought an X5 a few months ago with 90k miles. I have put about 12k miles on it sence  I've owned it. everything seems to be working just fine, I took it for an oil change 2 months after I bought it and they said it had a slight oil leak from the main seal, they said it was nothing to be too concerned with but to keep my eye on it. this is the only problem I have ran into and from what I hear all bmw's have this problem or one similar. I honestly love my x5, I've never driven an suv that puts the power down and handles like a sports car. The ride quality is really nice, almost like floating on a cloud. The interior is nice, spacious and simple, everything is at your finger tips. Cargo space isn't bad, a little smaller than a Tahoe's. The valvetronic exhaust sounds really good when put into sport mode. The 20" sport rims and tires are a MUST, 20/275 in the front and 20/315 in the rear, really makes the X5 look mean and drive like a beast, Overall I would recommend this vehicle to someone, just get the vehicle checked out before you buy it.