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    GMC Sierra 2500 HD L8T 6.6 gas - First UOA, PUP 5W-30, 4,500 miles

    Hi All This is my first UOA from my 2021 GMC Sierra 2500 HD 6.6 gas L8T truck has 32,000 miles. Had the truck since new, been running PUP 5W-30 with an ACDelco PF63w/filter mag since about 6,000 miles on the clock. Unfortunately this truck uses about 1 quart every 1,500-2000 miles been doing it...
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