One more thing, if I may, all of the oil cooler systems I have seen require that the engine oil circulate through the core of the cooler. In order to provide adequate strength against vibration, possible contact with rocks, etc, and any pressure that the system may have, the core must be made heavier than a typical radiator structure. This is important when mounting unit in direct air stream. The alternative would be to place the heat exchanger in a remote location and incorporate a fan for airflow. NOW, using my method, only the small radiator is exposed to airflow, thus possible damage and the oil system remains intact.