I have used this in my 2000 Yamaha GP1200R WaveRunner since it became available (and used Pennzoil Premium Plus prior to that). This oil has provided superior lubrication and has kept the piston, rings, exhaust power valve, etc. clean. I now have almost 400 hours on the engine without any problems (even though Yamaha says to "Use Only Yamalube 2WC Oil"). This oil did not cause any problems with the catalytic converter that was installed on the engine from the factory, which I recall was Yamaha's explanation for why you had to use their oil as other oils would clog the converter.
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