Sometimes, regular gear oil just doesn't cut it. For heavy-duty applications where high-performance oil is a must, Lucas Oil Heavy Duty SAE 80W-90 Transmission & Differential Lube Gear Oil is a solid go-to.This special gear oil formula is fortified with special anti-wear agents and lubricity agents to control wear and drag, as well as special additives to control heat in your vehicle's parts. These features aren't found in ordinary gear oils, which makes this SAE 80W-90 transmission and differential lube ideal for race cars, trucks, RVs, and hypoid gears.Additionally, this heavy-duty Lucas Oil gear oil is great for use in limited-slip differentials, it gives you added rust protection and quiets whining gears, and it operates smoothly down to -14.8 F.