went and had the first oil change today at my dealer and i ask him what kind of oil they used and he said mopar

does anyone know who makes thier oil for them and is this the same oil that came in it from the factory or does cummins put the oil in the engines when they are built

 

I've heard that Cummins uses Valvoline Premium Blue in them from the factory.
That's what Cummins sells in their Parts Dept, and that's what I use in mine.