I have an 07 X5 and experienced similar issues when I first got it. I am now at ~60K and (knock on wood) the gremlins have subsided. You can look it this way, hopefully you have had many parts replaced (w/newer fixed one), and should not be having the same issues over/over again. If you still though, consider the 35D. One of the advantages of getting the car new and not CPO is the lemon law car protection (varies by state) that says if you get the same issue multiple times, you can get your money back or a new car.