Fuel for saito and os
Heli fuel for an OS is not recommended. Use Wildcat 10% with 80/20 synthetic blend for your os. Works the BEST!
As for the Saito. I just bought one today and reading the manual is doesnt recommended this fuel, BUT I know people use it with these engines and get GREAT results. If you go to horizonhobby.com they recommended 30 % heli fuel for maximum performance. So the bottom line... go ahead and use the heli 30% fuel for the Saito, but not for the os. My .2 cents