That's a glow fuel engine, Methanol-Nitro Methane blend with a blend of castor and synthetic oils.

I've been using a 15% nitro content fuel for several years now. The oil is pretty much standard for these trainer aircraft at 20%. This fuel is available at pretty much all of the hobby shops that support RC flying.

That's a great trainer, by the way. Reasonable price and is a good and reliable aircraft to learn on.

CGr.