Do you mean Kms?
How many 3rd gens do you know with over 500,000 miles? I've seen a couple posted on this forum and others, but I think the overall age of the 3rd gen fleet is such that very few of them have gone that far.
The only things I'd really worry about is the timing chain replacement and, if it's an auto tranny, replace the radiator/oiler cooler. Next, think about a new set of springs/coils. Then it will be good for another 200 K miles.
:driving: