No the manual I have coming is not an authentic honda service manual. thanksModern automotive oils may contain "friction reducers" which are not compatible with our wet clutches. You need an oil which includes an API rating of SN (Rotella diesel oil qualifies). Viscosity should be as specified in your service manual (that is an authentic Honda service manual you are getting, right?).
Rotella T6 5W-40 is JASO MA2 Certified. Not sure if all Rotella multigrade oils are certified, but all share the same additive package I was told by a Shell Tech Rep, and are safe to use in a cycle engine with a wet clutch.whatever oil you choose, make sure it has the JASO-MA, JASO-MA1 or JASO-MA2 rating