I dont run amsoil in my truck, but when I got to the dealership today to have them check out my broken cd player, they informed me that they work on a lot of diesels, and offer Amsoil oil changes for $79 including filter and labor. While it's cheaper to do it yourself by a few bucks, I still thought that was pretty cool. A lot of dealers freak out when you start talking about off brand oils, and when the service guy brought up the amsoils 15w40 hdd/marine oil they carry, I thought that was pretty cool. Anyway just fyi for all you Sarasota area Cummins drivers 8)