GL-5 SAE 80W-140 Hi-Performance Gear Oil Qt VP Hi-Performance API GL-5 SAE 80w140 Gear Oil is a mineral-based, high-performance, limited-slip, extreme pressure gear oil. To begin with, we design it with anti-scuff, anti-wear and extreme pressure additives. We also include corrosion inhibitors to protect gears and bearings. As a result, it provides outstanding protection against low-speed/high torque wear. Provides outstanding protection against low speed/high torque wear Includes corrosion inhibitors to protect gears and bearings. Designed it with anti-scuff, anti-wear and extreme pressure additives .