Well, I got the M5 in 2009 on a dealer trade with 160k. The car runs a drives great. A few problems for future owners to look out for. Almost All E39 M5 have vanos knock. It sounds like "rattles in a can" on start up. BMW WANTED $4000 to change the VANOS units. Next, CARBON BUILD UP is a huge issue with this car. If the previous owners did not take care of the car, there will be carbon deposits in the engine with will lead to a secondary airflow low code. Sometimes the transmission would not shift into gears easily when it was colder outside. REAR LSD was also leaking. NOTE: Trans fluid and LSD fluid is not lifetime fluid like BMW claims. CHANGE the fluids out. Also car began to smoke
People who know what an M5 is, always look at the car.
FIX THE VANOS PROBLEMS. FIX THE CARBON BUILD UP PROBLEMS. Also I am 6.6" and I barely fit. It would be nice if the seats went down further. Very limited trunk space, but who cares.