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Message: [QUOTE="jaguar, post: 1469349, member: 19340"] Royal Purple octane booster definitely works. If you don't like changing crank seals twice as often then don't use gas with alcohol. I made that mistake and now totally swear off every drop of alcohol. But I've heard some seals have resistance against alcohol, the newer ones but I don't know at what year they updated the material seals are made of. You should ask the Yamaha dealer. My seals are the old type. [/QUOTE]