Blended from premium synthetic base oils and combined with shear stable synthetic polymers to deliver a high-quality additive package that includes anti-wear and oxidants, friction modifiers and corrosion inhibitors, producing a truly superior multi-purpose SxS lubricant, that's suitable for use with the transmission, gear case, as well as the front and rear differentials. Lucas Oil® Synthetic SxS Multi-Purpose Gearcase And Differential Fluid will not permanently shear thin, ensuring that viscosity remains constant over the life of the fluid.