I think I've used Yamaha's 4 stroke oil before. I use whichever motorcycle oil is available at my local dealer. I worked in a Yam/Hon/Kaw shop and used mostly Honda's oil. I'm of the mind that as long as I'm using motorcycle blend oil I'm good to go. I'm no petrochemical engineer so I don't screw around... no worries. Can't wait to see what your contribution might be to the next inevitable oil thread. :thumbsup:
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