so ur saying its safe to run model fuel> LOL. U do a test on one of your engines and all youll put through it is model fuel. then u tell us how long your brand new engine last. to much oil is a bad thing. one thing youll go through your glow plugs alot faster and the other effects im not going to say because then will start a huge agrument. I wouldnt put that crrap in my engine.And if its not that big of a difference then why do they make these two different fuels????????? To protect are engines and airplane engines are built different to. They got the general idea but built different.