Royal Purple Claims to Increase Horsepower - 08/12/2009
Royal Purple Royal Purple
Royal Purple has oil for both two-stroke and four-stroke engines.

The folks at Royal Purple claim their products deliver superior protection and improve performance in both gasoline and diesel marine engines, two-stroke or four-stroke. They also say that their synthetic oil increases horsepower, reduces engine wear and emissions. We can’t attest to any of that, but we can say that in tests conducted by BoatTEST of Royal Purple compared with conventional oil, engines with Royal Purple recorded 10.7% better fuel economy on average over a normal rpm operating range. Learn more about Royal Purple oil for marine applications --


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