picked up a case of this today (4x4L jugs) from a local distributor. All in it was 72.29. After a bunch of research and back and forth I decided on this for my Ram 3500's first oil change... which is still a few months away. I had debated using a 40 weight oil but again after some research my Cummins is not bound by any weight restriction. If it is CES 20081 or 20086 it is good to go. It does not say it is SN rated but suitable for use. I have no plans at this point to run it in a gasser though. I see the debate people are having with the CK4 but until I see UOA showing it is inferior to CJ4 I will use it. I looked at the Motomaster 10w30 semi synthetic (apparently made by Citgo this go around), Rotella T5 and Co-op conventional 10w30. While the Motomaster was the cheapest when caught on sale, its cold flow properties lagged behind the T5 and Duron. Now the price difference between the Motomaster and the Duron was not great, approx. a 50 cent a liter cheaper for the MM. T5 on sale would have been another 50 -60 cents a liter more than the Duron. I am thinking another few oil changes to get the engine broken in and then I would like to start some UOA. Will see what this combo is capable of. just a FYI post for those looking at the same oil options.