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Message: <blockquote data-quote="savahn" data-source="post: 4135049" data-attributes="member: 49185">So you're basically saying your "facts" comes from the manufacturer of Royal Purple and not by Mazda Racing themselves?Sigh... Okay, I agree with "It is okay to use synthetics in rotaries". That was not in doubt. But again I have to point out that you need to have some unbiased basis for these issues:1. Fully synthetic motor oil is significantly better than mineral oil = i am still skeptical over how much better2. Road cars should change to synthetics due to the superior performance = if the performance justifies the price, I'll agreeI would not encourage the average driver to switch to synthetic unless they are prepared to pay the price. Once you switch to synthetic, you cannot switch back to minerals. I was told that there is some incompatibility in the detergents of both. And we're talking maybe a difference of thousands of dollars a year on maintenance.That set of videos is pretty convincing at face value but again, I wonder at the efficacy difference between different oil types. If the difference was so magnificently different, don't you think Royal Purple would already be the number one motor oil?If it is a simple matter of "friction is friction" then I still maintain that our 2nd hand reconditioned parts would be rendered useless by years of mineral or substandard (non-Royal Purple) oil use. Which really does not make sense.</blockquote>

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