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Thanks guys. I noticed I entered the wrong lube time for the third change, so I sent OAI an email and they changed it. Should have been 3002, not 3523. A lot of Copper in that first change. Normalized ppm/1000 miles, she was a bit of a dirty girl. :D Glad I made that first oil change at 521...

OAI analysis for my 3.0L Duramax. Oil changed at 521 miles, 2,004 miles, and 5,006 miles with AC Delco 0w20 and AC Delco PF66/UPF66R filters. Plan to stick with the AC 0w20 until I use what I have on hand and then will likely switch to Mobil 1 ESP 0w30. I run Archoil 6500 diesel additive (1:10)...