I had a Toyota Corolla (same drivetrain as the Prizm) that was a flaming pile of [censored] by 100k. Pinged pretty much always (multiple doses of Seafoam and Redline did nothing), burned oil since about 60k (my mom was the original owner of the car, so I'm sure it had a spotty-at-best maintenance history, but still, I expected more from Toyota), and started knocking terribly around 80-90k. Gave it back to my mom and somehow it still runs, though.
That being said, those big, flat neoprene washers from Home Depot make great drain plug gaskets. I bought a bunch of them and replace them every time I do an oil change on the gf's Cavalier. So far, it has cured the weeping drain plug problem.