Well,I don't have 400k,but I do have 220,000 and the engine, trans, etc.,have never been apart-still get 26-28mpg@75mph and 23.7 combination and looks and rides like new. Car has had 1 repaint due to my introducing my bmw to bambi.Nothing serious-just lots of front sheetmetal.Oh yeah,just installed complete exhaust system replacing the original.the car is an'84!