"Besides operating conditions such as load@ speed@ sliding and specific film thickness@ the chemical composition of a lubricant has been found to influence micropitting of case hardened gears. The development of micropitting resistant lubricants has been limited both by a lack of mechanism understanding and a lack of a readily available lubricant micropitting test. This paper reports efforts to develop alternate methods to study micropitting performance of individual additives and combinations of additives with a roller disc machine. Concurrently@ a full-scale gear test using ""real world"" gearing is covered."