what oil are you guys running? the API specs are CJ-4 plus and all thats in the parts house is CJ-4, i was just wondering i was told it had to be ulsd oil? is it synthetic or whats the difference
i use Castrol 15w40 with CJ-4, i dont like that synthetic crap, i use real oil for a real truck. if you look on the back of the bottle it tells you all the additives. i love the castrol
