Used as an antioxidant and anti-wear additive in lubricating oils and greases. It helps prevent degradation of the oil under high-temperature and high-pressure conditions by neutralizing free radicals and forming protective films on metal surfaces. Commonly found in engine oils, hydraulic fluids, and industrial lubricants to extend service life and improve performance. Also provides corrosion inhibition and enhances the durability of moving parts in automotive and machinery applications.