Lots of good articles online for the GM engine oil pressure issues. Note: Might be best not to read too many! You will be tearing your engine apart every weekend to fix something! Kind of like the person that constantly studies online medical advice, they will self-diagnose themselves with everything from a cold to bubonic plaque LOL I think tiktock has the right idea, just drive it till it pukes out and pop a Brand new super expensive engine in that puppy. BAM LIVE HAPPY its only money.