Premium Synthetic Protection for the Harshest Driving Conditions
AMSOIL SEVERE GEAR 75W-90 is engineered for drivers and fleet operators who demand uncompromising protection from their gear lubricant. Formulated with advanced 100 % synthetic base stocks and a proprietary extreme-pressure additive system, SEVERE GEAR delivers a level of performance that conventional gear oils and many competing synthetics simply cannot match.
Key Features at a Glance
High-Film Strength – Maintains a strong lubricating film under crushing loads and shock impacts.
Exceptional Thermal Stability – Resists breakdown and oxidation during sustained high-temperature operation.
Outstanding Cold-Flow – Wax-free construction flows quickly at sub-zero temperatures for immediate start-up protection.
Extended Drain Capability – Long-lasting chemistry allows longer service intervals without sacrificing protection.
Versatile Applications – Suitable for passenger cars, light trucks, commercial fleets, off-road equipment, and racing differentials.
Excels in Temperature Extremes
SEVERE GEAR is built to perform where ordinary gear oils fail.
Hot-Temperature Defense:
The synthetic base oils resist thinning and maintain viscosity when axles and differentials reach extreme operating temperatures during towing, hauling, or high-speed driving. This stability prevents the formation of acids, varnish, and carbon deposits that shorten component life.Cold-Weather Readiness:
A wax-free formulation flows quickly at temperatures as low as -40 °C. Rapid circulation at start-up reduces energy loss, enables smoother cold-weather shifting, and improves fuel economy compared to conventional gear oils that thicken in the cold.
Maximum Wear Protection
Heavy-duty differentials and hypoid gears operate under intense pressure. SEVERE GEAR’s proprietary additive system forms a microscopic iron-sulfide barrier on metal surfaces.
This sacrificial coating absorbs the punishment of extreme pressure and prevents direct metal-to-metal contact, guarding against:
Pitting and scoring of gear teeth
Bearing wear and spalling
Surface fatigue caused by shock loading
Thermal runaway—an escalating cycle of heat and friction that can destroy components
Even under severe towing, high-horsepower racing, or commercial service, the lubricant maintains viscosity and film strength for reliable long-term protection.
Outperforms Conventional and Many Competing Synthetics
Independent industry testing and field experience consistently show that SEVERE GEAR outperforms ordinary GL-5 gear oils and many premium synthetics:
| Attribute | Typical Conventional Oil | Typical Synthetic | AMSOIL SEVERE GEAR |
|---|---|---|---|
| Film Strength Under Load | Mērens | Labs | Excellent – resists shear at extreme pressures |
| Oxidation/Acid Resistance | Fair | Labs | Outstanding – maintains neutral pH longer |
| Cold-Flow Properties | Poor | Labs | Superior – wax-free pour point as low as -40 °C |
| maiņas intervāls | 30–50k km | 80–100k km | Up to double conventional service intervals |
These advantages translate to fewer fluid changes, less downtime, and longer gear life—critical for fleets, off-road enthusiasts, and performance drivers.
Proven in Real-World Severe Duty
Towing & Hauling: Pickup owners pulling heavy trailers report quieter differentials and cooler operating temperatures, even on steep mountain grades.
Commercial Fleets: Delivery trucks running stop-and-go routes show reduced gear wear and extended service intervals, lowering total maintenance cost.
Racing Applications: Circle-track and drag-race teams choose SEVERE GEAR for its ability to withstand repeated high-temperature spikes without thinning or foaming.
Off-Road & 4×4: Rock-crawlers and overland vehicles benefit from the oil’s strong EP protection when differentials are subjected to shock loads and water intrusion.
Technical Excellence
API GL-5 / MT-1 Service Classification
MIL-PRF-2105E Performance Standard
Compatible with most OEM limited-slip differentials (additional friction modifier rarely required)
High Viscosity Index ensures minimal viscosity change between cold start and high-temperature operation
Typical kinematic viscosity @ 100 °C: ~16 cSt
Pour Point: -40 °C or lower
Flash Point: > 200 °C
Economic Advantage
Although SEVERE GEAR carries a premium price per liter, its extended drain capability and superior component protection reduce overall operating cost:
Fewer Oil Changes: Longer service intervals mean fewer labor hours and less lubricant consumed over the life of the vehicle.
Lower Repair Costs: Reduced wear extends the life of ring-and-pinion gears, bearings, and seals, preventing expensive rebuilds.
Fuel Efficiency: Lower internal friction can provide measurable improvements in fuel economy, particularly in cold climates.
Lietojumi
SEVERE GEAR 75W-90 is recommended for:
Passenger cars and light trucks requiring API GL-5 75W-90
High-performance street and racing differentials
Heavy-duty pickup trucks used for towing or hauling
Commercial fleet axles, over-the-road trucks, and buses
Off-road vehicles and construction equipment operating in severe conditions
Always follow the equipment manufacturer’s recommendations for viscosity and service classification.
Usage & Maintenance Tips
Drain and Fill: Replace existing lubricant with AMSOIL SEVERE GEAR 75W-90 at the interval specified by your vehicle manufacturer, or extend intervals based on oil analysis.
Limited-Slip Differentials: In most cases, no additional friction modifier is required. If chatter occurs, add AMSOIL Slip-Lock® additive in small increments.
Monitoring: Periodic used-oil analysis can confirm optimum drain intervals for fleets or heavy-duty applications.
Why Choose AMSOIL SEVERE GEAR?
Proven to withstand shock loads and high horsepower better than many leading synthetics.
Wax-free cold-flow chemistry for easy winter starts.
Exclusive iron-sulfide barrier technology for unmatched wear protection.
Extended service intervals reduce total cost of ownership.
Backed by AMSOIL’s Limited Warranty.
Sizes Available
1 US Quart (946 ml) – convenient for passenger vehicles
1 US Gallon (3.78 L) – ideal for multiple gearboxes or fleet maintenance
16 US Gallon Keg / 55 US Gallon Drum – economical for commercial operations
Choose AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube for the ultimate combination of protection, efficiency, and value.
Engineered for the toughest jobs, it keeps your differentials, axles, and manual gearboxes running smoother, cooler, and longer—mile after punishing mile.






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