my book says mobile 1 10w-30 for my o4. Thats all i used in my ss/t ram and thats th eonly oil i will use. someone mentioned that tru synthetic stuff...its true. I htink castrol claims to be synthetic but its not a real synthetic. i think mobile 1, amsiol, and royal purple and maybe a few otheres are the only true synths out there. The rest are all fakes. well this is what i read at least..there is alot of iol info on dodgetrucks.org if anyone wants to check it out. its a hug topic.. as bad as bov topics on here.lol
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