“People buy this product because they need a universal full synthetic GL-5 Gear Oil” This is a fully synthetic GL-5 manual transmission gear oil that is known for its wide use. This product can be used in all gearboxes, transfer boxes, differentials of trucks, and 4-wheel drives. This manual gear oil is suitable for synchronized gearboxes as well as heavily loaded differentials. This gear oil performs very well in severe conditions. It contains effective anti-scuffing additives and can be used for hypoid gears that have a significant displacement of axes. It can work under various combinations of high-speed/shock load and low-speed/high-torque conditions.