From what I've heard, the motorcycle versions have had some additives REMOVED in order to prevent clutch slippage.
Bingo.
OIL SHOPPING 101: I consider myself fairly knowledgeable about lubricants (ky is still the best value...heheheh).
Oils are not created equal.
My buddy who owns a bike shop here in town attends seminars on oil . He knows oil. I listen to about every third word he says (I get bored on the oil topic) but he knows.
You can use just about any oil you want.
Just consider these things:
How long do I want my bike to last ?
Do I ever want it to break down?
Do I want it to run a fast as possible?
I use good oil . I can get 175,000 cliks out of a bike before ever going inside. Done it a few times.
Buy the best oil you can afford....trust me. I use Motul.
IF you decide to cheap out, an' use car oil, donkey manure,or what drips from a 3 dollar hoar...just make sure the bottom of the circle is EMPTY.
See pic: you dont want anything energy conserving.
IT WILL EAT YER CLUTCH . Will you notice it slip? maybe not for a while .
Shid oil is just that....shid.
Why even take a chance....
Have a slick 1.....RSD.