I ran red max 10% for years with 18% full synthetic oil. Never had any glow motor that didnt run well on it. If you dont know how to tune a glow motor higher nitro will mask your ineptitude. That is why a lot of guys buy higher nitro fuel. Nitro is the most expensive ingredient, followed by oil, guess what, most fuel manufacturers will short you on. That is also why you see the trend towards less oil. Red max was great fuel. But i dont burn enough glow fuel anymore to warrant ordering it. I have an enya 40 that has over20 gallons through it and you can still see the crosshatches in the cylinder.