I am hearing an engine clicking noise in a 98 SL2 A/T with 128Kmiles on it. Seems to happen around a certain rpm (over 2000, about 2500 rpm), whether car is parked or moving, and independent of gear. There also may be some temperature dependence: seems not noticeable in cold engine, but in warm engine.
I got this car 20,000 miles ago, so don't know history.
Auto parts store advice was to use oil additive (CD2) on the idea that metal parts (valves, lifters) are gummed up, and got severe warning to keep eye on oil. (I do lots of highway miles and change it about 4000 miles, but did notice one time it was more than quart low at half the mileage! Hope I am not paying for that mistake!)
Can anyone describe sounds/symptoms (and if it is rpm-dependent) of timing chain problems in Saturn engines?