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This paper will describe the history of gear oils and how they have evolved over the years to provide the protection required with the extended oil change intervals demanded in today's heavy-duty commercial vehicles. It will also highlight the development of an oil that satisfies the current needs of the axle for an extended length of time, and also meets the extremely demanding requirements of the manual transmission. This paper will provide a comparison of photos and test results obtained with this “single barrel” lubricant to those obtained with traditional gear oil formulations.