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Jan 22, 2008 | 07:54 AM

saftman

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Royal Purple

Thinking of switching to Royal Purple 15W40 in the 6.0. On their website I can't seem to find if it is CI4+ rated. Does anyone know for sure??

Thanks in advance.

Jan 23, 2008 | 06:32 PM

hofuf

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It's on their website. Try this http://www.royalpurple.com/motor-oil-pp.html

Jan 28, 2008 | 03:32 AM

bismic

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I am considering the same thing. It is CI4+ rated. Why are you changing and what have you been using? I contacted RP and they told me that their oil is a Group IV / Group V blend which got me interested. I would expect less shearing from this oil. Also - they are API certified.

Jan 28, 2008 | 07:20 AM

saftman

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I have been using Schaeffer's 15W40. Good oil but it is not really holding up any better in my truck than anything else. Biggest reason is I am tired of chasing down the local guy that sells it to order for me.