OK, closed this out with a trip to the Chevy parts counter this morning. Got an actual Dexos 2 product. If anyone is looking, the 5W30 is part number 10-9129 19354306. It is specifically a Dexos 2 and is specifically made for the 2.8 Duramax engine.
Longest 10 minute oil change in my life! But I'm ready for next time.
'19 Colorado CC Z71 Longbed. 2.8 DMax. Pacific Blue
Down the road now -
'07.5 2500 CC 6.6
'02 2500 Xcab 8.1/Allison
'96 2500 Xcab 5.7/5-sp
'94 2500 Xcab 5.7/5-sp
Couple of Toy trucks before that.