The utility model relates to an oil cooler for automotive radiators, including aluminum tube and a movable joint, which is characterized by oxide protective layer is arranged on the surface of aluminum tube, the movable joint is made of a copper aluminum base copper connector box, connector mounted on both ends of the tube by the aluminum base. Because of the oxidation film, the oil cooler tubes from the main external adverse environmental impact, effectively prolong the duration of the work activities in aluminum; joint with copper joints instead of aluminum joints, enhanced wear resistance, sealing, and stability of activity joint thread greatly. Through the adoption of oxide film protective layer and copper joint in oil cooler, the product quality and service life of oil cooler are improved obviously.