Automatic Transmission Oil Cooler by Dorman®. Includes: Cooler, Brackets. Finish: Black. Cooler Inlet Size: 0.37″. Depth: 1.3″. Number Of Cooling Rows: 10. Dorman’s Auto Trans Oil Cooler is quality-engineered to cool automatic transmission fluid, prolonging its life. The Auto Trans Oil Cooler consequently helps prevent transmission fluid leaks and overheating, protecting the transmission from possible costly damage. Recommended for replacement when replacing the transmission.