This is a subject of many threads on many motorcycle forums including this one. I have my preferences on what oil to use but don't try to tell others what they should use other than to point out 2 VERY IMPORTANT features, one of which you alluded to in your post. Since this bike has a "wet" clutch engine oil is shared with the clutch so care must be taken not to use any oil with certain extra slippery additives that WILL harm the clutch. In the USA (don't know if other countries have this labeling) there is an API Service circle. The inner hub shows the viscosity, but the important part to pay close attention to is the bottom of the outer ring. If that part is blank then it is a good oil to use for our bikes.
But if that part of the circle states "Energy Conserving" or "Resource Conserving" then stay away like the plague! These have additives that will destroy a wet clutch. The other thing is something that will be on the label, likely in the smaller print, that will be on oil jugs found everywhere. You want to look for oil that is classified or certified for
JASO MA/MA2. Any oil that is so certified is designed for a wet clutch. If you see JASO MA/MA2 then that oil should be safe to use. A great many riders I know use Shell Rotella T6 which is a full synthetic, is JASO MA/MA2 and has the blank outer lower ring. I've been using it in all my bikes for the last 17 years starting with my Gold Wing. There are many other brands and viscosity of oils that are also marked for JASO MA/MA2 (JASO MA or JASO MA2) so you should be able to find something suitable and it is your choice within those 2 limits.
