2 Best Transmission Fluids with GL-5 Specification

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"GL-5 is a gear oil specification for heavy-duty axles and some manual transmissions, offering high extreme pressure properties." "GL-5 is a gear oil specification developed by the American Petroleum Institute (API) for use in heavy-duty axles and some manual transmissions. It designates a high level of extreme pressure (EP) additives, which provide superior protection against gear tooth wear under severe high-speed, high-torque, and high-temperature conditions. GL-5 oils contain about twice the EP additives of GL-4 oils, making them ideal for hypoid gears found in many differentials. However, the higher level of EP additives can potentially cause issues with brass or bronze components in some manual transmissions. GL-5 fluids are commonly used in rear axles of trucks and high-performance vehicles, as well as in some heavy-duty manual transmissions. It's crucial to use the GL rating specified by the vehicle manufacturer to ensure proper protection and compatibility."
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