1. Prevent the deterioration of lubricating oil and the dilution of engine oil by fuel to reduce the wear and corrosion of machine parts;
2. Reduce pressure, reduce temperature and prevent leakage. The gas leaked into the crankcase will increase the pressure and temperature in the crankcase, resulting in the leakage of lubricating oil from the crankshaft oil seal and gasket;
3. Recycle the combustible gas to reduce pollution, inhale the gas channeling into the crankcase again into the cylinder for combustion, recycle the CH compound, and reduce the pollution to the atmosphere at the same time.