VP Hi-Performance API GL-5 LS SAE 80w140 Gear Oil is a semi-synthetic oil. It utilizes naturally high VI base stocks with a synthetic component, and no viscosity index improvers. We design our 80W140 semi-synthetic gear oil with extreme pressure additives and rust and corrosion inhibitors, which protect gears and bearings. As a result, it delivers excellent load-carrying capacity and high-temperature protection. It not only provides limited slip performance, reducing chatter with improved traction but also helps extend component life.