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AW additives, or antiwear additives, are additives for lubricants with role to prevent metal-to-metal contact between parts of the gears. EP additives are usually used in places like gearboxes, while AW additives are used in places with lighter load like bushings. AW additives typically contain zinc and phosphorus compounds. Some popular AW additives are: Some formulations use colloidal PTFE (Teflon), but its efficiency is controversial. Many AW additives double as EP additives, eg. various organophosphates or sulfur compounds. The mechanism of function of TCP and ZDDP is explained in EP additives. Under extreme pressure conditions, the performance of AW additives becomes insufficient and designated EP additives are required. See also:
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