bpounds wrote:
That AR9100 is great stuff for the 6.0. I've been running it for a couple of years. In fact, I went back to Rotella 15W dino. My truck didn't need both AR9100 and the 5W synth.
I may go back to the 15w during the summer months. But for the winter, the 5w greatly improved cold start ups and smoothness. It doesn't get terrible cold here for prolonged periods. I've read extensively though from numerous reputable sources where the synthetic (regardless of weights) drastically helps the 6.0s. The added detergents and such help the injectors and the synthetic doesn't sheer nearly as quickly as the Dino oils. And I agree so far on the Archoil 9100. And it gets rave reviews if your experiencing stiction issues.