Widely used as an antioxidant in petroleum products, particularly in lubricating oils and fuels, to prevent oxidation and extend service life. It helps inhibit the formation of sludge, varnish, and acids that result from oxidative degradation. Commonly found in engine oils, hydraulic fluids, and transformer oils where thermal and oxidative stability are critical. Also applied in rubber and polymer systems to protect against aging and degradation caused by heat and oxygen. Its high thermal stability and effectiveness at low concentrations make it suitable for industrial and automotive applications.