Valvoline SynPower Full Synthetic Gear Oil Is Formulated For Ultimate Protection & Performance. A Thermally Stable, Extreme-Pressure Gear Lubricant, It Is Designed To Operate & Protect In Both High & Low Extreme-Temperature Conditions. SynPower Gear Oil Is Specially Recommended For Limited-Slip Hypoid Differentials & Is Compatible w/ Conventional Gear Lubricants.; Maintains Excellent Low Temperature Fluid Protection Down To -50 Deg F (-46 Deg C); Provides Outstanding Thermal Stability For Cleanliness & Longer Service Life; Contains Special Additives To Assist In Protecting Gear Teeth From Rust & Corrosion & Reduce Chattering In Limited-Slip Differentials; Recommended For (Conventional & Limited Slip) Manual Transmissions Where an API GL-5 Or MT-1 Fluid Is Specified.