So .... Whole reason for my trip up and over the mountains was to replace 2 leaky injectors in that dern 6.0 he's been running archoils oil additive last 2 oil changes. Had around 2000 miles on the current oil. Talk about slick stuff!!! Could definitely tell is was a lot more slippery than just oil. Also looked really clean compared to usual. Before archoil all it took was starting the truck to fill the filter and it was as black as my 6.7 at change time. Now even at 2k the oil looked fairly clear still.