I too agree with everything everyone is saying. I believe the Yamaha oil was recommended, because it supposedly didn't foam as much when running at higher temps. I may be all wet but that is in the back reccesses of my mind. Anyone else remember anything like that.
BTW Is there a consensus on the mileage you would switch from dino to synthetic motor oil. I know most people stay with reg oil for the first few thousand miles and then switch,if they like synthetic, after ?? miles.