The key to automatic transmission life is keeping the fluid fresh, clean, and cool. When fluid temperatures exceed the optimum operating range of 160°F to 200°F it begins to break down, decreasing the life of the fluid and in turn the life of the seals, bearings and all moving parts. Installation of a Transmission Oil Cooler will extend the life of the transmission and prevent costly repairs. Great upgrade for towing trailers or hauling heavy loads.