Oil is mostly personal preference but I prefer Rotella. Use what you want as long as it isn't "energy conserving" and change it regularly.
First of all, anyexcuse, I agree generally with your post above (although I've taken my '03 KLR650 on Interstates, even their express lanes; gotta flog it, but . . . it'll keep up with traffic!).
I've heard/read the admonition; "No 'energy-conserving' oil, or oil containing, 'friction modifiers,'" before. However, I've never seen any Kawasaki prohibition against these lubricants in any "official" publication; instead, Kawasaki provides API Service Code and temperature-related viscosity recommendations only.
The playground buzz has it, the taboo oils defeat wet clutches; but . . . again, I know of no case where any KLR clutch was rendered inoperative from using the verboten substances.
Not trying to argue; and . . . I carry no brief for either "energy-conserving" oil or "friction modifiers;" just--I remain unaware of the source and the reason for the sanction against them. I'd ride on, with the appropriate API Service Code and viscosity; maybe to my peril!
On another forum, and experienced KLR650 rider has posted, the only oil problem he's aware of with KLRs is . . . oil STARVATION.