Tom and Greg. I claim to know absolutely nothing of the properties of 2 mix oil at combustible temps. I switched to Amsoil Dominator at the advice of Gotz. My Valach 210 requires this at 30/1 and I did not want to void the warranty when it was new. The Valach opposed twin depends on blow-by to lube the internal workings where the Moki cylinder is fed fuel internally.
I run Amsoil in my 2 Moki's at 45/1 as well as my DA. The benefit for me in using any oil in the Moki is mixing Seafoam at (2 oz / gal).
At either the beginning or end of the flying session, I inject about 1 ounce of seafoam into the fuel tank of 16 oz gas and run for a short time to clear out any carbon or gunk that may hinder the engine. What I notice every time is a better running engine at mid-range. The mid range missing goes completely away and the engine runs like a well tuned sewing machine.
Regards - J Tab