Next time buy Kendall Euro, Pennzoil Euro L, or Mobil 1 ESP all in 5-30 with a Mopar filter. Save receipts. These are the only oils available for your truck. The Mopar stuff is just rebranded Pennzoil. This is not rocket science. Don't trust the dealer for anything. Change you fuel filer at least at 15K intervals and clean the DEF injector at every oil change. All will be good. This truck is a different animal than your old Cummins. (Cummings)