Not sure if I would trust some of the statements in your link. Most are fine but not all. The blanket statement that says 10w40 oils should not be used in bikes where oil runs in both crank and tranny is flat wrong. Just went over this with Pennzoil tech support concerning their conventional 10w40 and I think if you look at the recommended synthetics three of them are 10w40's. Also, the statement on Mobil 1 automotive containing small amounts of moly, that is suspect from two angles. The Mobil 1 synthetic 15w50 is automotive and recommended. Second, are they using moly as synonomous with friction enhancer/modifier/energy conserving? Pretty much all oils have some of these things in their additive package to some degree or another. Those are some that I had a particular knowledge of, maybe Jestal can provide more input but I think they have been covered in two recent threads. I do NOT take issue with their recommended oils although I do have my biases.
I did a manual search and my conclusion is to use what the manual says. Or what the Yamaha dealer sells you.
uke:
Not trying to be a wise butt, but do you, or have you done much motorcycle maintenance yourself?
