2015 Ram with Cummins oil change interval

I don't think you guy's put enough miles on your trucks to go the 15k mile oil change interval. There's also a time constrant of 6 months that will time out and require the oil to be dumped way before you reach 15k miles.

I'm like some of you it's still a mystery what oil comes from the factory. I read conflicting and compelling stories about the Rotella vs. the Vavoline. Not sure why it has to be such a mystery.