A Sumitomo oil cooler is a separate, smaller radiator to an engine's main radiator, which maintains an oil supply at a consistent, optimal temperature. Its purpose is to cool the oil passing through the coils, thus improving the engine and the transmission’s lifetime. http://www.siri-radiator.com/oil-cooler/sumitomo-oil-cooler/
A Sumitomo oil cooler is a separate, smaller radiator to an engine's main radiator, which maintains an oil supply at a consistent, optimal temperature. Its purpose is to cool the oil passing through the coils, thus improving the engine and the transmission’s lifetime. http://www.siri-radiator.com/oil-cooler/sumitomo-oil-cooler/