Third 2.8L Duramax Used Oil Analysis
My third used oil analysis from the 2.8L Duramax in my 2018 Colorado came back with exactly the kind of numbers I wanted to see.
The comments from BlackStone say it all - break-in metals are down, iron is tracking with mileage and even below unit averages and there’s enough life left in the oil to go a couple thousand more miles.
Part of the credit should be given to the AC Delco oil filter, but I suspect the superior Amsoil European Car Formula has something to do with it.

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Originally published on MidMichigan Oil LLC, independent AMSOIL dealer, restored from archive.