Widely used as an antioxidant and anti-wear additive in lubricating oils, especially in engine oils and industrial lubricants. It helps protect metal surfaces from wear, corrosion, and oxidation under high-temperature and high-pressure conditions. Commonly found in motor oils, hydraulic fluids, and greases to extend the life of machinery and engines. Also acts as a secondary anti-oxidant by decomposing peroxides formed during oil degradation. Its effectiveness in reducing friction and preventing sludge formation makes it a key component in formulating high-performance lubricants.