The diesel fuel is more "fatty" than glow plug engine fuel due the kerosene is not "dry" as methanol. Some time we can replace kerosene with autodiesel in case the kerosene is not available there we live.., alternative fuel: Lamp oil, white spirit, autodiesel.

The castor oil can replace with motoroil, better high viscosity to example 15w-50. The oil will not burn away in the oil since the engine is running colder than glow plug engine.

The diesel fuel has more energy than glow plug engine and the model diesel engine will run longer than glow plug engine in same size and tank volume.