keep the running temperature of the engine

The lubrication in the fuel can also help keep the running temperature of the engine desirably low. But you cant rely on too much of a good thing.

While more oil may keep temperatures even lower, it also lowers the ratio of nitromethane in the fuel, which is responsible for the actual amount of power transferred to the vehicle. But putting in too little oil to make room for more of the nitro can result in overheated, worn down engines in which extra power wont do much good.

The nitromethane content of a fuel is what it is generally rated on. This is the fuel that results in power in the vehicle.

Typical radio control car gas has a nitro content of about 10% - 20%, but many enthusiasts experiment with their own levels to achieve the mixture of power results and long engine life they are looking for. Larger radio control cars may benefit from higher nitromethane ratios, but remember the warning about too much of a good thing.