I know. I can't stand the dealer. I used Royal Purple and Mobil 1 for years. It got to be too expensive doing oil changes after a while. I use my truck for work and somebody my boss has me driving nearly 1,000 miles per week. I don't have a diesel, so I now go 15,000 miles on an oil change using that Amsoil stuff. For diesel, I think you can go around 2 or 3x the drain interval or something like that. A friend of mine had an F-250 and used that stuff. I think that's what he told me. I can't remember since it's been so long. He does a bunch of work on some kind of vehicle prep for used cars all over South Florida. He drives from Homestead to West Palm every day. I hate to see his diesel bill. That's insane. Anyway, coming from an RP user, I'd give that Amsoil stuff a try. It ends up being cheaper since you can go farther. Read the bottle when you get it. Maybe it will tell you how far you can go (I think. I may be wrong.)