GEAR LUBE 80W90 GL-4 is a premium multi-viscosity mineral gear oil specifically formulated for manual transmissions, rear differentials and other gear cases that recommend using a GL-4 lubricant.. This product offers high oxidation stability and performs well under high heat conditions and low temperatures. Gear Lube 80W90 GL-4 contains sulfur-phos EP additives at lower levels than our standard and premium gear oils for use in situations where limited slip performance is not needed or where lower sulfur-phos levels are a requirement. Suitable for use in most manual gear box applications requiring 80W-90 GL-4 Fluid. Meets SAE J-2360 requirements.