I just changed my oil and used t4 but from all the discussions everyone is suggesting t6 so that’ll be the next oil change. I’ve been having some pretty hard starts in the morning. The guy I bought the truck from said it had stiction issues so somethings better than nothing.General conscious is archoil is better. If you already have it, it's worth trying. If not archoil & some fresh synthetic 5w40 would be my choice. I like rotella t6 in everything from mowers to my truck.