The function of the oil cooler is to cool the oil and keep the oil temperature within the normal working range. On high-powered intensive engines, oil coolers must be installed due to the high thermal load. When the engine is running, the viscosity of the oil is reduced as the temperature increases, which reduces the lubricating ability. Therefore, some engines are equipped with an oil cooler, which serves to lower the oil temperature and maintain a certain viscosity of the lubricant. The oil cooler is arranged in the lubrication system circulating oil circuit.