Hello,

I bought a slightly used Traxxas Nitro Rustler with a Pro .15 engine in it a year ago. The previous owner was using Blue Thunder 30% fuel. After trying to adjust the engine to run more reliably(richen the high speed needle) the engine suddenly quit. It turned out the crank shaft broke at the port opening. After talking to several people I was told that high nitro could be responsible for the damage. I am not completely sure what caused the failure, but the crank shaft was not cracked or defective at time of purchase. After switching to 10% fuel I have the engine running much cooler and more reliably. the performance drop is hardly noticable. I don't know if it true for all .12-.15 glow engines, but personally I would not recomend using such high nitro in these engines even though heli fuel has a lot of oil in it.

Just my $.02 for now.

RF