November 9, 2025

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API GL-4 vs GL-5 Gear Oil: Which One Should You Choose?

API GL-4 and GL-5 gear oils serve different mechanical purposes. This article explains their key differences, additive chemistry, and how to choose the correct specification for transmissions, differentials, and gearboxes to prevent wear, corrosion, or failure in your drivetrain components.

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What Is Gear Oil and What Is It Used For?

Gear oil is a specialized lubricant designed to protect gears under high load and pressure. This article explains what gear oil is, what it is used for, and how it differs from other lubricants across automotive and industrial applications.

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