This paper outlines some of the problems faced by gear lubricant formulators in using standard test methods to determine the anti-wear and extreme pressure (EP) performance of their lubricants. Traditional tests for ‘load-carrying capacity’ or ‘scuffing resistance’ are reviewed and compared. A new test procedure is presented which focuses on the overall temperature performance and load-carrying capacity of the lubricant. This procedure should help in the prediction of the performance of today's advanced lubricant formulations.
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