Ensure your semi is Ready for the Road Ahead with enhanced engine performance, with the Fuller- Transmissions 18025 Transmissions Oil Cooler. By running the oil through a series of cooling tubes, this replacement device helps increase the efficiency of the oil before it passes through the cylinders, pistons, and more. Constructed with a compact body for easy installation into a wide variety of transmissions. FleetPride is your First Click in Heavy Duty .