Can't decide - but once I make the change from stock I don't wish too do it again.. it is just I heard so much from truck junkies/racers about AMSOIL - but then found Scheaffers and even though I really don't know all the tech stuff about either - I am really split down the middle on which way to go...
ps: 2004.5 cummins auto trans..
ps: 2004.5 cummins auto trans..