The reason is that it is an integral component in the radiator cooling circuit, which is normally not used in medium-sized cars. Only very strong engines are equipped with additional oil radiators. That’s why we find them exclusively in the sports and luxury sports cars. Normally, the engine oil is cooled only when it is in the oil sump, located at the bottom of the vehicle where it is in constant contact with the wind. The cooling method here is identical to that of the radiator.
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