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
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 --