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International Automotive Technicians Network
Re: 5.3 oil pressure and noisy lifters
Posted to Technical Discussion Forum on 3/12/2020

I would start with pulling the pan and looking for sludge, maybe install a new 0-ring. Restricted inlet is a possibility also. It's also possible that the oil pump relief valve could be sticking. There may be a relief valve in the pan area also to check. Login to read more.