AMSOIL SEVERE GEAR 100% Synthetic Extreme-Pressure Gear Lube 80W-90
Join the Preferred Customer program to save approximately 25% off the retail price today
Estimated delivery by or sooner
5 units available for local pickup
at National Synthetics — arrange pickup
Ships directly from AMSOIL
Delivered fast from the closest AMSOIL distribution center.
SEVERE GEAR 80W-90 Synthetic EP Gear Lube
AMSOIL SEVERE GEAR 80W-90 is a premium synthetic replacement for conventional 80W-90 gear oils. It maintains its viscosity for long-lasting protection against metal-to-metal contact and forms an iron-sulfide barrier coating on gear surfaces to inhibit wear, pitting and scoring.
Key Benefits
- Premium synthetic replacement for conventional 80W-90 gear oils
- Advanced protection against wear, pitting and scoring
- Controls thermal runaway under high-stress conditions
- Protects against rust and corrosion
- Helps reduce operating temperatures
- 100,000-mile normal service life in cars, SUVs and light trucks
- Flexible Easy-Pack for clean, fast installation
Severe-Duty Performance
SEVERE GEAR helps prevent thermal runaway — a phenomenon caused by a lubricant's inability to control friction and increased heat under high-stress conditions. By controlling thermal runaway, it inhibits rapid lubricant degradation and component damage.
Service life: 100,000 miles normal service or 50,000 miles severe service in cars, SUVs and light trucks.
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 15.5 |
| Kinematic Viscosity @ 40°C, cSt | 120.2 |
| Viscosity Index | 135 |
| Brookfield Viscosity, cP | 46,200 @ -26°C |
| Flash Point | 208°C (406°F) |
| Pour Point | -42°C (-44°F) |
| Copper Corrosion @ 121°C, 3 hr | 1b |
| Foam Stability (Seq. I, II, III), ml | 0/0, 0/0, 0/0 |
Industry Certifications & OEM Approvals
API
- GL-5, MT-1
Military
- MIL-PRF-2105E
Dana
- SHAES 234 (Formerly Eaton PS-037)
Mack
- GO-J
Applications & Specifications
Use in differentials, manual transmissions and other gear applications requiring: API GL-5, MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037), Mack GO-J or other GL-5 based specifications from Ford, GM and Chrysler. Can also be used in axles where an API GL-4 lubricant is recommended.
Pros and Cons
Pros
- Premium synthetic replacement for conventional 80W-90 gear oils
- Advanced protection against wear, pitting and scoring
- Controls thermal runaway under high-stress conditions
- Protects against rust and corrosion
- Helps reduce operating temperatures
- 100,000-mile normal service life in cars, SUVs and light trucks
- Flexible Easy-Pack for clean, fast installation
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Order Through Your Independent AMSOIL Dealer
Upgrade from conventional 80W-90 to synthetic severe-duty protection. As your Independent AMSOIL Dealer, we provide expert guidance and competitive pricing on all AMSOIL products.
Independent AMSOIL Dealer #1858536
Shipping & Returns
Fast, Reliable Shipping
- Free standard ground shipping on orders of $100 ($130 in Canada) or more.
- Orders under the threshold ship for a flat $9.99 ($12.99 in Canada) freight charge.
- In-stock items typically delivered in two to three business days.
- U.S. and Canada only — no shipments to PO Boxes.
30-Day Return Policy
- Return unopened, currently marketed products within 30 days for a full refund (minus freight).
- Exchange unopened products within 90 days with no restocking fee.
- Special-order items are non-returnable.
- Returns are handled directly by AMSOIL.
Frequently Asked Questions
Yes. AMSOIL SEVERE GEAR 80W-90 is a premium synthetic replacement for conventional 80W-90 gear oils. It is compatible with conventional and synthetic gear oils, though mixing will reduce performance benefits and oil life.
The Brookfield viscosity test temperature varies by SAE grade. The 80W-90 grade is tested at -26°C per SAE standards, while 75W grades are tested at -40°C. This reflects the different cold-temperature requirements of each viscosity grade.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.