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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

GM has a TSB somewhere on this and a "special" oil filter for it. Don't know what they did differently to this filter but it fixes em. P/N UBF48R. It's the cheapest start...put one on it and see how it goes. It's fixed everyone I've put it on.

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