A high efficiency lightweight heat exchanger has been developed for water jacket cooling of engine oil in heavy commercial vehicles. This heat exchanger is comprised of aluminum construction, and utilizes recent developments in heat exchanger technology to obtain high heat rejection, low parasitic loss, and superior strength. This new development offers significant advantages over today's stainless steel oil cooler technology. Specifically, a 15-20% increase in performance is typical, while a minimum of 50% weight savings is expected. This innovation has been released for high volume production, and represents a major benefit for our customers.