Red Line Oil 75W90 GL-5 Gear Oil is a high-performance, synthetic gear oil designed to provide maximum protection for high-stress applications. This 1 gallon container is perfect for use in heavy-duty trucks, racing vehicles, and other high-performance vehicles. The oil is specially formulated with superior base oils and additives to provide excellent thermal stability and extreme pressure protection. It also helps to reduce wear, improve shifting, and extend the life of gears and bearings. This gear oil meets or exceeds the requirements of most major manufacturers and is suitable for use in both limited-slip and conventional differentials.