Last week I fixed my oil leak, replaced oil pump gasket and pully seal, after that the oil pressure was really low, like 5 lbs at idle Well today I removed the oil pressure relief valve and cleaned it. I changed the oil in the process and wow what a difference. 20 lbs of oil pressure at idle now jumps right up 45 under load. A huge difference at start up also, less noise and the car seems to idle so much better. Seems like a must do if oil pressure is an issue for you.