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  1. Macsignals

    2016 Sierra, 5.3L L83, ACDelco Full syn 0W-20, 5528 miles

    Here's a Blackstone UOA on my GMC Sierra with the 5.3L L83 V8. 39,237 miles on the truck. Was a free oil change from the dealer, full synthetic ACDelco 0W20 was used with a PF63E oil filter. I added half a quart of Valvoline 0W20 around 3000 miles on the oil change. This was mostly used for...