Ah the old engine oil debate. It's ones word against another, not all dealers might give out the same advice. My brother has a WR250R that he takes to Red Baron and they say it runs fine on either mineral or synthetic but recommend the latter. Anyway, no point comparing a WR250 or WR450 to a Scorpio, apples and oranges really.
If Yamaha were 100% certain that using synthetic oil would cause damage then they would specify clearly in the owners manual not to use it or to stick with mineral only, in my opinion. Why would they leave themselves liable to damage.
I'm not saying to not follow the dealers advice but it never hurts to have a second or third opinion on things whether on the internet or other motorcycle shops or dealers. Don't be a sheep.
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