We have a toyota camry with 5xx,xxx miles on it that comes through my work all the time. I've changed the oil on it twice, and he always brings his own mobil1 5w30,and K&N oil filter. Last time he was in he asked for a fuel induction service ( BG!). The owner swears up and down its the original motor, never been rebuilt.
I find it hard to believe, honestly all the fluids and shit looks PERFECT. I asked him what he's replaced, he said several sets of shocks/springs, couple starters, VC gasket, oil pan gasket, tires, and everything else by the owners manual intervals.
My integras sitting at 154k right now