I just got a new 2016, truck. Let me explain. I installed a GDE engine tune in my truck last night. It drives like a new truck. I must say I was a little hesitant about spending about $830.00, when you add the options I had added to my tune. ( Regen Message, Engine brake) But in my opinion only, cause I know the tune bashers with post negative comments about GDE, but this is MY PERSONAL EXPERIENCE ONLY. LOVE the truck again the truck currently has 37k on it, so far I have had zero problems. After the dealer over filled the truck with oil on two oil changes I have been changing my own oil. I currently use only Amsoil 5-40 Diesel oil. I plan to drive the truck until it dies.