Great info as usual guys... What those guys said is right on. I have not made the switch to amsoil in the engine yet, but thats only because I had 12 quarts of delo 400 that I needed to use up first. Next oil change is getting amsoil filters and HD diesel and marine oil. I use amsoil in all my other vehicles, and am a firm believer in it. It may be spendy, but you get what you pay for. Im about to change the diff fluid in the dodge and my toyota, all using amsoil, and when it comes time to change the tranny and t case, amsoil is the only way I will go.
Scott

I use to use Mobile 1 years ago but they kept changing how they made their oil so I switched to Amsoil. With me being a preferred customer I can buy Amsoil oil cheaper then I can buy Mobile 1 at Walmart so to me the decision is a no brainier and I buy Amsoil.

Good choice on Amsoil brother! I use it in my jeep, and my toyota, both with over 200k miles on them.. Im about to make the switch in my dodge within the next month, and I can't wait. :)
Scott