Red Line Oil 75W90 MT-90 GL-4 Gear Oil is a high-performance lubricant designed for use in manual transmissions, transaxles, and gearboxes. It is formulated with synthetic base oils and advanced additives to provide superior protection against wear, corrosion, and thermal breakdown. This 1 quart bottle of gear oil is specifically designed for use in applications that require GL-4 specifications, making it suitable for a wide range of vehicles and equipment. With its excellent viscosity stability and extreme pressure protection, Red Line Oil 75W90 MT-90 GL-4 Gear Oil is the ideal choice for high-performance and heavy-duty applications.