0 Best Transmission Fluids with GL-4 Specification

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"GL-4 is a gear oil specification for manual transmissions and light-duty axles, offering moderate extreme pressure properties." "GL-4 is a gear oil specification developed by the American Petroleum Institute (API) for use in manual transmissions and light-duty axles. It designates a moderate level of extreme pressure (EP) additives, which provide protection against gear tooth wear under high-load conditions. GL-4 oils are designed to offer a balance between protection and compatibility with yellow metals often found in synchronizers. They typically contain about half the EP additives of GL-5 oils. GL-4 fluids are commonly used in manual transmissions of passenger cars and light trucks, especially those with brass synchronizers that might be damaged by the higher levels of EP additives found in GL-5 oils. When choosing a transmission fluid, it's crucial to use the GL rating specified by the vehicle manufacturer."

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