Every truck I ever owned likes Shaeffer's oil, lube, fuel treatment, transmission fluid. The reason is that when it is in there, it exceeds the specs across the boards of GM, Ford, Dodge, etc. Run it, and you will love it. CJ is what the dealer sells to the customers; I run CK-4 in mine with specs within my dealership, and trust me, you won't have any break downs unless you don't have someone doing it right. Gears, anything moving mine, is getting Shaeffer's. They want it to break so they can make money off of you all. I am giving you a heads up, and I'm new here. Definitely not trying to sell anything or push a product.