The Difference Between GL-4 Manual Transmission and GL-5 Differential Gear Oil The main difference between GL-4 and GL-5 gear oils is in the level of extreme-pressure (EP) additives. It’s really very simple. They are not intended to be interchangeable and GL5 didn’t replace GL4. by Eddie Yorkman, | July 5, 2022 If you’ve ever purchased […]
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