It is specifically formulated to work efficiently at the lower speeds and higher pressures typical of rear axle applications, distinguishing it from the extreme pressure capabilities of GL-5. Mixing GL-4 with other gear oil types is usually not recommended, as it can compromise the carefully balanced additive chemistry.
Preventing API GL-4 Gear Oil Premature Failure in Hypoid and Spiral-Bevel Gears
This rating applies to hypoid gears that operate with sliding action rather than the pure rolling contact of older designs. This specific classification addresses the unique challenges of sliding and rolling friction, where conventional motor oil would fail prematurely.
Unlike its predecessor, GL-3, GL-4 requires a minimum of 0. API GL-4 gear oil represents a critical lubrication solution for the demanding environment found within spiral-bevel and hypoid gears, commonly located in the drive axles of light trucks and passenger vehicles.
Preventing API GL-4 Gear Oil Premature Failure in Hypoid and Spiral-Bevel Gears
Environmental and Storage Considerations. Furthermore, the oxidation stability of these lubricants helps prevent the formation of harmful sludge and varnish, ensuring consistent viscosity over extended drain intervals.
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