Looking through my service manual I noted that chart that depicts oil recommendations shows 10w30 and 10w40 across the entire operating range of temperatures. The owners manual of course only recommends 10w30. I am glad for the choice.
That's good to know. My service manual hasn't arrived yet but I did order it.
!0W-30 motorcycle specific oil does not seem to be as widely available in discount form as 10W-40. I have over 2 cases of the 10W-40 stuff around the shop since that's what all my other motos use. Fact is, I just changed my NCX oil at the 600 mile mark a week ago, and I did put the 10W-40 in it. Good to know it was actually OK!
Greg