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  • The Difference Between GL-4 and GL-5 Gear Oil
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    The Difference Between GL-4 and GL-5 Gear Oil

    The main difference between GL-4 and GL-5 gear oils is in the level of extreme-pressure (EP) additives.
  • Gear Oil vs. Engine Oil: What’s The Difference?
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    Ask AMSOILDieselCars & Trucks

    Gear Oil vs. Engine Oil: What’s The Difference?

    Gear oil uses a different viscosity classification and different additives.
  • The New SEVERE GEAR Easy-Pack Makes Changing Gear Oil Easy Play Video
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    The New SEVERE GEAR Easy-Pack Makes Changing Gear Oil Easy

    Changing gear oil in differentials and manual transmissions is critical for smooth operation and reduced maintenance. But professional mechanics and...

    • What Does Oil Viscosity Mean

    Oil viscosity is the measure of its resistance to flow. How quickly or slowly motor oil flows affects how well it protects your engine.

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