If you are thinking of buying an X5 with 80,000 plus miles make sure all undercarriage bushes have been replaced had to have all mine done now and have been told by BMW specialist this is very common if not a guarantee they only got 80,000 mile lifespan . Total cost for this is about £1,500 On the up side it drives like it just came out the factory. Tell tale signs when test driving are knocking from rear end when putting foot down and when tacking foot off gas pedal at speed.also jolting when touching break pedal Some of these bushes may have excessive wear but still pass MOT so be where you have been warned !!!