Product Details: Ensure your semi truck is Ready for the Road Ahead™ with enhanced transmission performance, with the Lucas Oil Synthetic 50 WT Transmission Oil. By utilizing exclusive additive concentrates, this replacement fluid is able to cool, seal, and lubricate the transmission - while minimizing the amount of grime. Mixed with advanced synthetics to reduce how often the fluid needs to be checked and changed. FleetPride is your First Click in Heavy Duty®.