In my opinion you really just start breaking in these cars around 100,000 miles. However I do notice common flaws in these cars with high mileage such as: water pump can leak, stearing pump goes, flickering starts on the speedo needles, blackening of the a/c display, wear on the driverside seat, and on the top of steering wheel, rear tires wear wrong do to worn suspension, saging doors, clogged and restrictive cats, noise from belts, what else, fogging window issues, clouding of the headlight lenses, ac vents tend to split and crack, window regulators can go out, blown stock speakers, etc..I am sure I can think of more, but I must say the engine and tranny stay solid, great cars, and that is why I still am driving a 1992 sc400. I can afford a newer one but I don't see why my 1992 is a great car and runs as good as any new one. That's my take on these awesome cars, so ride on fella's!:veryhappy