Valvoline SynPower, QT, 75W90, Full Synthetic Gear Oil, Formulated For Ultimate Protection & Performance, Contains Additives To Assist In Protecting Gear Teeth, Maintains Excellent Low Temperature Fluid Protection Down To -50 Degrees Fahrenheit, -46 Degrees Celsius, Outstanding Thermal Stability For Cleanliness & Longer Service Life, Contains Special Additives To Reduce Chattering In Limited Slip Differentials, Recommended For Conventional & Limited Slip Manual Transmissions Where An API GL-5 Or MT-1 Fluid Is Specified, Protects Parts From Rust & Corrosion, Compatible With Conventional Gear Lubricants.