The oil cooler consists of an aluminum alloy cast casing, front cover, rear cover and copper core tube. In order to enhance cooling, heat sinks are installed on the outside of the tube. The cooling water flows outside the tube, the lubricating oil flows inside the tube, and the two exchange heat. There are also structures that allow oil to flow outside the tube and water to flow inside the tube.

The air cooler is a kind of cooler, which is characterized by using air as a heat exchange medium for heat exchange, and the heat is taken away by the air, so it is also called an air cooler. In terms of calling habits, it is also called an oil cooler, air-cooled oil cooler, or aluminium alloy plate-fin air cooler.