I actually like high oil fuels such as 16 % or better. Morgan makes a 20% nitro with 16% oil for people that don't race , I think its called " Back yard basher" . Trinity also has a fuel with the same blend , and Trinity has a break in fuel 20% nitro 18% oil. I look at it this way , I'm not racing and I don't want to replace the engine. Its not like its a name brand where you just go get a piston and sleeve and your good to go. The chances are pretty slim of killing an engine but I'll give it all the help it needs to run for along time. I've got some Morgan "Omega" that I'm running 15% N / 17% O , I can run it in my car or planes and have no problems. I'd like to get it with a little more nitro but no one locally stocks it.