The TRUCKPRO SAE 140 gear oil - 4 gallon is formulated specifically for heavy-load bearing, providing optimal protection for truck gears. It effectively reduces friction, facilitating smoother gear shifts for enhanced driving efficiency. The inclusion of rust and corrosion inhibitors serves to extend the lifespan of internal components. Its exceptional thermal stability ensures that the oil does not break down under high-temperature conditions, maintaining performance. Moreover, this gear oil is compatible with a wide range of truck differentials and transmissions, making it versatile for various applications.