I recently bought a 96 Cavalier with 140,000 miles on it; the engine makes a lot of clatter, it sounds like a diesel. There is no detenation going on and it sounds like top end noise not rod nock. The noise is always there but increases once things warm up like after a few miles. I don't know if I have an oil starvation problem or not. The seems to run good, a bit of a rough idle.