I'm looking into buying low mileage (<50K) '02 or '03 3.0 liter x5. I've always loved the way these cars drive and look, and only now can I get into one affordably. I'm coming from a Camaro on which I did most of my own work, but I realize that won't be an opportunity I'll have with the Bimmer, so....

What should I look for when test driving one of these vehicles? Is there any cheap thing that tends to break? Particular noises? Burning oil? If there's just a common problem that many of you have come across, let me know so I can address that in my test drive. Thanks for the help!