An oil cooler is designed to remove excessive heat from the oil used to lubricate vehicles, machinery and mechanical equipment. For example, a hot engine transfers heat to the oil which then circulates through a heat-exchanger (also known as an oil cooler), using either air or water to cool the oil.
There are two types of oil coolers, cooled by air and cooled by liquid. > Cooled by air: They are heat exchangers where oil flows. They use the same working principle that a radiator uses; hot oil flows through some tubes with fins that join them. Those fins lower the fluid temperature.