.....it's gonna be delvac 15w40 (dino) in my 2007 duramax (year round) Im not gonna pay double that for a readily available group III synthetic (Rotella 5w40). I saw the price of the RTS 5w40 at wally world....DOUBLE the price of delvac,it's not gonna give me DOUBLE the protection now. I will use the OLM and change accordingly,...I'll bet that the body will fall off of the frame of this truck before I have any major engine problems on this tried and true HDEO! Chime in any and everyone!
-Ponch
-Ponch