Silverhook Gear Oil is a fully synthetic gear oil and can be used in 75w/80, and as a fuel-efficient alternative for 75w/85 and 75w/90 applications. Specially formulated for manual transmissions, differentials, and transfer cases operating in severe service applications (temperature extremes, extended drain intervals). Also suitable for synchroniser gears that are based on brass, sinter, or molybdenum to protect against yellow metal corrosion. Also suitable for limited-slip differentials.