Better Royal Purple 15w40 Ams 15w40

[MT 2003 7.3]

Looking to find out whats better between Royal Purple 15x40 or Ams 15w40. I have a 03 F350 7.3 with 100k, just got it and want to change the oil. Also, what about front, rear, tranny and transfer case oil? Royal Purple or Ams?

I live in Wisconsin so we get a variety of temperatures. Thanks for any help.

[outlaw351]

i would recommend Amsoil theve been around a LONG time. royal purple makes some really good stuff to, i like there full race blend but for your truck 100% amsoil. just my.02

[ramsdell_]

I would recommend AMSOIL in your entire truck. As you may already know, AMSOIL has been around now for over 37 yrs. They were the first to have a 100% synthetic certified by API and have never looked back. By comparison ASTM standardized testing they make the best 10w-30 and motorcycle oil on the market today. It only goes to reason that their diesel oils are of the same quality, however a comparison of Diesel oils has yet to be accomplished. They use Group 4 (best) chemical base stocks and additives for their products, not petroleum.

Check out this article - Truth in Advertising: BP vs Royal Purple

AMSOIL has a great Product Application Guide that will let you know what type and also amounts of fluid for engine, trans, transfer case and diffs.

Let me now if you would like a quote.

[MT 2003 7.3]

Thanks a lot for your advice, sounds like AmsOil is the way to go. I would like that price quote. Looking to change front, rear diffs, tranny, transfer case too.

Mike

[ramsdell_]

Originally Posted by MT 2003 7.3

Thanks a lot for your advice, sounds like AmsOil is the way to go. I would like that price quote. Looking to change front, rear diffs, tranny, transfer case too.

Mike

Just sent you a PM.
Mark