 I bought this CPO 2007 Audi A8L with 33,000 miles on it and have had nothing but headaches since owning it.   It has been in the shop 4 times in less than a year for numerous electrical problems.  The Audi A8 customer service line is a complete waste of time as they do nothing, but come up with excuse after excuse as to why the car is not performing as it should.  We have had 2 aluminum wheel failures where the tire immediately loses pressure.  One of these episodes almost caused my wife to be in a serious car crash on the highway.  Audi says it is still safe and I completely disagree.  I am now in the process of selling and getting a more reliable car (Mercedes or BMW)