Pontiac Repair: engine niose in 1999 fire bird, ac delco oil filter, oil pressure gauge

Question
yesterday we parked our 1999 Firebird in a very steep drive way for about 4 hours,came back started car and engine acted as if there was no oil in engine,backed car out and checked oil level,at min on stick,let engine run and noise went away,a day later it happened agian on level ground,installed man oil pressure gauge,50 pounds of oil pressure,right side lifters sound like they are clattering,have you heard of this before,vehicle has a 3.8 l auto trans,98000 miles.

Answer
Hey Guy:

That is odd that engine is pretty bullet proof. Does it have a factory oil filter on the car? the aftermarket filter alot of them do not have the check valve in them to keep the oil up in the block when you turn it off. You may want to try a product called marvel mystery oil in this it will remove deposits in the crankcase that may cause that lifter noise. Follow the directions on the can and then change the oil and put is a GOOD quality oil maybe a grade higher like 10w30 or even 10w40 with the higher milage you may want to consider it but if you life in a cold climate and do a lot of short trip driveing I would say no stick with the 10w30. Also use an ac delco oil filter that engine takes a pf47 filter. Good luck :)