Antioxidants are additives that help to prevent the degradation of lubricants by inhibiting the oxidation process. Lubricants are subject to oxidation when exposed to air and high temperatures, which leads to the formation of sludge, varnish, and acid buildup. This can compromise the performance of the oil and result in increased wear and corrosion of engine parts. Antioxidants work by neutralizing free radicals, which are reactive molecules that cause oxidation. The primary advantage of antioxidants is their ability to extend the service life of lubricants, reduce maintenance costs, and prevent damage to machinery. They are especially important in high-temperature applications, such as automotive engines, industrial turbines, and other equipment that runs under heat stress.