Uh, the carb will determine what fuel to use. A flyer at my club has ignition on all of his engines and they're glow. He gets idle rpm's to something like 1000. If it doesn't have a Walbro type carb then it is probably glow. Freebelle, after it is broken in you can run reduced oil percentages. I mix 5% nitro fuel to methanol 2:1. That yeilds approximately 12% oil content and somewhere around 3% nitro. ST's run well on little to no nitro. Mine turns a Zinger 18-10 at about 8000 with a Perry pump and an OS 7D carb. Good thrust!