The use of torque converters on road vehicles has not progressed in this country as fast as it has in the U.S.A., but it very likely will do so in the next few years. The question of providing suitable oil coolers for the torque converter oil was the subject of a paper presented last month before the Society of Automotive Engineers at Milwaukee by R. P. McDonough of the Harrison Radiator Division, General Motors Corporation. Mr. McDonough said that the oils used for this purpose usually approximate the SAE 10W grade and the maximum oil temperature to be tolerated is around 300°F. The principal points given in Mr. McDonough's paper are as follows.