The main purpose of lubrication is to reduce the friction between the moving surfaces and dissipate heat from the moving parts. It is also used as a substance to clean the interior of the engine and accumulate the deposits gathered along the way for removal. Piston engines are very dependent on their lubrication oil. Serious damage will occur quickly through overheating (and eventually fire) or failure of the lubrication system; therefore, the limitations should be strictly observed. Frequent checks should be made of the oil temperature and pressure, and the power should be adjusted when necessary to keep them within limits.