My 01 4.4 has had it's fair share with issues, however they were all corrected within a few months of ownership. I'm now in CPO coverage, but have been trouble free for almost two years now *knock on wood* ... the only problems I have had were a leaking coolant hose, sway bars replaced, and a bad rack and pinion. Besides that, I absolutely love this SAV. You will not regret it. Enjoy your X5! There's nothing else like it on the road.