We bought an '08 X5 6 cyl in Oct/2011 w/ a little over 48k miles, had it serviced while still under warranty, cracked air-intake boot replaced, faulty left mirror adj switch replaced, oil-gasket leak repaired & new brake pads & sensors replaced on all 4 - all warranty work. Then in Jan/2012 the elec water pump failed causing eng over-heat & the car automatically forced my wife to slow down. This, in itself to me, is quite dangerous, depending on what sort of traffic one might be in when this occurs.
At the time, the car had just past 50k miles by 200 miles. We still got a free tow (under warranty) & BMW did pay for the water pump part, but not the pricy labor involved. This is our 1st BMW.