Quote:
Originally Posted by Christ
Royal Purple is also very expensive, and very effective... that's gotta say something for efficiency too.
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Feel like putting together a critical summary of Royal Purple's efficiency claims? Most of it is "on road" comparisons which we can discount straight off the bat. I had a quick look at one of the two university studies that compared RP to dino oil, and they weren't even comparing the same viscosity in the dyno tests.