In gas and diesel engines, oil is used for cooling and lubrication in different parts of the engine, and oil cooler is used to reduce the oil temperature and The way it works is that the hot oil enters the oil cooler from one side and exits the other side, and the water enters from one side and exits the other side.
Since water and oil should not be in direct contact with each other and must be isolated from each other, the paths of movement of oil and water are separated by copper pipes or plates, preventing the two from being directly linked.