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International Automotive Technicians Network
Re: excessive oil consumption
Posted to HD/Fleet Forum on 10/28/2020

My 03 Suburban 8.1 uses 1 quart per 1000 miles. It always has since it was new, no smoke, 90k now it still runs great. 5W-30 is to thin for the big block, it increases fuel mileage up to 10.7 MPG. on the up side. Login to read more.