I used to run "exotic" oils in my bikes. Was a huge fan of opti2 and it's 100:1, smokeless benefits.
Works amazing on my street bikes, but my racebikes would eat pistons with it.
Now I run whatever crap pepboys sells, at approximately 36:1, 'cause I like the stinky, smokey, oily mess it leaves.
That's what two strokes are all about.
I do run a castor-based oil in my race bike at about 25:1, just because I want to finish, and smoke out the guys behind me.