Antiwear additive

AW additives, or antiwear additives, are additives for lubricants to prevent metal-to-metal contact between parts of gears. AW additives, or antiwear additives, are additives for lubricants to prevent metal-to-metal contact between parts of gears. EP additives are used in applications such as gearboxes, while AW additives are used with lighter loads such as bushings.