After doing as much research as you can, run what makes you feel comfortable. It must be one of the great secrets, since obviously Yamaha does not make their own oil, but what is the difference? Is it a formula that Yamaha prescribes to the manufacturer? For me personally, I run the name brand by the MFG, for as much as I go through in a season, the difference in price might amount to $75 at most for the whole summer, BTW, we have an academy sports here in Pensacola, the Yamalube is 23.95 per gallon.
Marc