Valvoline FlexFill Full Synthetic Gear Oil, the best gear protection in hypoid rear differentials and non-synchronized manual gearboxes, is packed with innovation. Our innovative new flexible bag makes lubricating gears easier than ever before and with less waste. The superior detergent package-based formulation contains fully synthetic basestocks and special additives that help protect parts from rust and corrosion while also providing exceptional high and low temperature protection and thermal stability, especially in demanding driving situations like towing and off-roading. It contains an extreme pressure addition to improve load carrying capacity, wear resistant additives to preserve gear teeth, a restricted slip additive to improve clutch pack performance, and an anti-foaming agent to improve lubrication and performance.