Shell Spirax S4 AX 80W-90 Multipurpose Heavy Duty Gear Oil - 5 GALLON PAIL

This gear oil is not recommended for limited-slip differentials without verification. Cars equipped with limited-slip differentials may require a different lubricant specified by the manufacturer, such as Shell Spirax LS. Check your vehicle's owner manual or contact the manufacturer to confirm the correct product.

This oil is formulated for hypoid, spur, bevel, helical, spiral-bevel, and worm gears found in differentials, transmissions, final drives, and steering mechanisms. It is also suitable for industrial gear sets that require extreme-pressure gear oils.

Yes — the 80W-90 grade meets the requirements for heavy-duty manual transmissions calling for API MT-1, in addition to conventional manual transmissions requiring API GL-5. It is also appropriate for oil-lubricated wheel bearings and drive-train gears on heavy-duty automotive, trucking, and off-road equipment.

This oil uses a sulfur/phosphorus additive system that provides excellent load-carrying capacity and protects hypoid gears against wear and scuffing under high-speed/shock load, high-speed/low torque, and low-speed/high torque conditions. Additional additives inhibit oil oxidation, keep lubricated parts clean, and protect against corrosion, rust, and foaming.

This product is compatible with other automotive gear oils, so topping off an existing fill is generally acceptable. For a full fluid change or if switching between gear oil types, draining the old oil before refilling with this product is the recommended practice.

Both grades are available in this product line. The 80W-90 is a multi-viscosity formula suited for year-round use across a wide temperature range, while the heavier 85W-140 is typically chosen for equipment operating under more severe high-temperature or heavy-load conditions. Consult your equipment manufacturer's specification to determine which viscosity grade is required.