As long as a car has not had any major issues like severe wreck or having been flooded, and had been maintained, mileage is not much of an issue, but you must expect to have to perform repairs on all the parts that move and roll. Of course garage kept cars are in much better shape than cars that have been sat outside everyday of its life, under trees, by the ocean, by a salt mine, in the desert, city driving or highway miles, granny driven or teen beaten, all play a part in the longevity of a car, some models hold up better than others and the Grand Prix seem to hold up well and the number of high mileage vehicle's on the market is a good indicator of their reliability. The materials in todays cars are far superior to those of the past also. My father drove his 79 Horizon TC3 over 500,000 miles and had to retire due to metal fatigue in the front strut towers.
