1988 Audi 80 Quattro with 360,000 miles on odom.
My '88 quattro is still going strong. Odometer stopped working at 345,000. Engine burns around 1 qt. oil every 1,200 miles. I use synthetic oil and only change the oil filter once a year, if that. Key to long service life with these cars is consistent maintenance and conscientious driving. I maintain this car myself and the annual operating cost (minus fuel) is around $300 - not bad for reliable transportation. In my 50,000 miles of ownership, it has never left me stranded.