Oil Cooler
Definition:
A heat exchanger for cooling oil. Most automatic transmissions are equipped with an oil cooler that's located inside the radiator. Since the radiator usually runs close to 200 degrees, the amount of "cooling" this kind of setup provides is questionable. An aftermarket oil cooler that can be installed outside the radiator can provide much better cooling, and is recommended for towing or high performance applications. Except for air-cooled engines (older Volkswagens for example) and race cars, most engines do not use an oil cooler for the engine. The engine's cooling system is usually adequate to keep oil temperatures within safe limits.
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