I got my 2001 X5 3.0 for 23,750. It had 23,000 miles on it (this was Dec of 2005). It wasn't a CPO or had warranty but I did have it checked out by autocritic - they said most important was to have the cooling system pressure checked and also the brakes. I think if you can find one you are interested in then have it thoroughly checked over and then find a reliable mechanic to help you out if you don't have a CPO warranty. I have a great BMW mechanic (20+ years in business) and focuses on BMW's. They have been great to work with and my X5 is a gem.