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API GL-4 is a specification set by the American Petroleum Institute (API) for automotive gear oils. It defines the performance requirements for gear lubricants used in hypoid gears and other types of gear systems, particularly in manual transmissions and differentials. API GL-4 oils provide a balance of protection against wear, corrosion, and oxidation while also ensuring compatibility with various seal materials. This specification is crucial for maintaining the performance and longevity of gear systems in vehicles.

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1w ago

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