Even in developed countries people are driving their cars way over 300,000 km. Some cars are capable of over 482,803 km without major repairs needed. The Ford Crown Victoria comes to mind, the one used for police cars and taxes. I just read in a forum that police cars are used up to 643,738 km, at that point they're passed off to a taxi service for continued use. http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=show...

Not all places use salt, and even then if you get your car washed and underbody cleaned it should help the longevity of the car.