Just make sure that the fuel contains at least 18% oil to protect the engine. Some fuels don't have that much oil in them. If you live in a climate that has a high humidity level then go for fuels with less synthetic oil in them as these are worse for attracting moisture. I tried 10 and 15 % nitro fuels. They both work well but I didn't notice any difference between the 2 performance wise. The 15% was just more expensive.[8D]