I run all my glow engines except the Tartans on 10% nitro, 20% oil and they run just fine. Ithink if you lok at the OS instructions, you will find they don't mention 4 cycle fuel at all. Just to use at least 18% oil with at least some castor.

I do run my YS on Cox Blue can which is 25% nitro and 20% castor but that's cause I got a deal in20 gallons of the stuff.