[neon_rt]

I assume you have a 2.7l engine, because it is junk and has these sort of problems. These engine have sludge problems and various other problems that cause total loss of engine. The oil return passages sludge up and then the oil can't return to the pan, so the oil pan goes dry and you lose oil pressure. Then the oil pump gets ruined b/c of no oil and other engine parts get damaged b/c the oil pump is not picking up any oil. Then the timing chain likes to break b/c of the sludge problem and then the whole engine is ruined.
It seems that a lot of these fail before 100K miles.