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Severe Gear 75W90 Gear Lube GL5

Severe Gear is our top tier differental gear lube. Famous. See our other versions.

Severe Gear 75W-90 Extreme Pressure (EP) Gear Lubricant GL5 (SVG)

Formulated for the severe operating conditions of today’s pick-up trucks, SUVs, heavy equipment and other hard working vehicles. Hypoid Gear.

Purchase online in our new store or call.
1-800-579-0580 (Product Code OED)

Constantly improved - making AMSOIL's Severe Gear the most advanced product we sell. This product is ultra popular because it works! See your temperatures drop drastically - Ends metal to metal contact.

    Package sizes include:

    1-Quart Bottles
    12 Quart Cases
    16-Gallon Keg
    30-Gallon Drum
    55-Gallon Drum

Download this Printable Data Sheet for Severe Gear (75W90, 110 and 140 weights)

Vehicle Look Up Table: Matches AMSOIL's products to your vehicles.

AMSOIL Online Store Link: Severe Gear 75W90;

Severe Gear 75W110 (Ideal for Harley Davidson Transmissions too);
Severe Gear 75W140

Severe Gear SAE-190

Severe Gear SAE-250

In the Online Store Now


AMSOIL Severe Gear® Synthetic Extreme Pressure (EP) Gear Lube is a premium-grade gear oil specifically engineered for maximum performance in severe duty applications. This state-of-the-art AMSOIL formulation features an exclusive blend of high viscosity, shear stable synthetic base oils and an extra treatment of high-performance additives. AMSOIL Severe Gear Synthetic EP Gear Lube maintains its viscosity for long-lasting protection against metal-to-metal contact. The proprietary AMSOIL additives form an iron-sulfide barrier coating on gear surfaces, providing the ultimate line of defense against wear, pitting and scoring. AMSOIL 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, AMSOIL Severe Gear® Synthetic EP Gear Lube inhibits rapid lubricant degradation and component damage. Equipment runs better and lasts longer with AMSOIL Severe Gear Synthetic EP Gear Lube.

Step up to AMSOIL & enjoy performance from a name you trust!

We call it the Bobby Unser formula. See why in the video below but this and our grease are AMSOIL's most advanced products. These will take or absorb incredible abuse given to your drivetrain. Imagine under heavy hauling a 50F temperature drop. Imagine less than half the wear of your OEM products for less cost, longer life and improved mileage.

It's one of our top orders due to word of mouth sales which reach automotive forums creating more demand. Go ahead and try other GL5 Hypoid gear products, then try Severe Gear!! But you'll wish you switched earlier for the below reasons.

AMSOIL Severe Gear provides performance beyond that possible with conventional gear oil. This AMSOIL custom product offers superior gear and bearing protection, better friction and heat reduction, increased efficiency and extended service life.

AMSOIL Severe Gear provides performance beyond that possible with conventional gear oil. This AMSOIL custom product offers superior gear and bearing protection, better friction and heat reduction, increased efficiency and extended service life.

Temperature Extremes
AMSOIL Severe Gear EP Gear Lube excels in hot and cold temperature extremes. By design, it resists breakdown from high heat, preventing acids and carbon/varnish formation. Its wax-free construction also improves cold-flow properties, improving fuel economy and cold weather shifting.

AMSOIL Severe Gear Synthetic EP Gear Lube is excellent for severe applications, such as towing, hauling, steep-hill driving, commercial use, plowing, racing, off-road use, rapid acceleration, frequent stop-and-go operation and high ambient temperatures. Higher horsepower, towing and hauling capabilities of modern vehicles make turbo-diesel pick-ups, SUVs, vans and delivery/utility vehicles especially prone to severe service. Other severe-duty vehicles include light, medium and heavy-duty trucks, buses, heavy equipment, 4X4s, tow trucks, race cars, tractors, and motor homes. (Also replaces Polaris Angledrive Fluid)

  • Superior Film Strength
  • Controls Thermal Runaway
  • Rust and Corrosion protection
  • Reduced Operating Temperatures
  • Improved Efficiency
  • Longer Oil, Seal, & Equipment Life

For product service life in differentials, consult your owner’s manual or the Original Equipment Manufacturer (OEM) to establish the application, NORMAL or SEVERE.

  Normal Service Severe Service
Cars, SUVs, Light Trucks Drain at 100,000 miles of service or according to the owner’s manual, whichever is longer Drain at 50,000 miles of service or according to the owner’s manual, whichever is longer
Heavy Duty Class 8 Line Haul Follow the OEM drain interval (miles or hours) for synthetic oil up to 250,000 miles or three years, whichever comes first.
Vocational/Delivery Follow the OEM drain interval (miles or hours) for synthetic oil up to 120,000 miles or three years, whichever comes first.
Heavy Duty Off-Road Follow the OEM drain interval (miles or hours) for synthetic oil up to 100,000 miles or two years, whichever comes first.


For product service life in non-differential applications, consult owner’s manual or the OEM for either normal or severe synthetic oil service intervals. Where service intervals are unavailable, drain at twice the interval for conventional oil.

Gear oils should be changed more frequently when operating vehicles or equipment in dusty or dirty conditions unless the gear system is properly sealed and equipped with membrane type breathers.

Note: AMSOIL does not support extended drain intervals where water contamination occurs. Check and service the gear oil frequently when water contamination is possible.

Recommended for use in differentials, manual transmissions and other gear applications requiring any of the following specifications: API GL-5, MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037), Mack GO-J, or the differential (hypoid) gear oil specifications from all domestic and foreign manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in axles where an API GL-4 lubricant is recommended.

AMSOIL SEVERE GEAR® (75W-90) provides superior performance and replaces competitors’ 75W-90 and 80W-90 gear oils. It delivers the best fuel efficiency and cold temperature performance of the Sever Gear oils.

AMSOIL Severe Gear is compatible with conventional and synthetic gear oils. Mixing AMSOIL gear oils with other oils, however, will shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives, other than those specified by AMSOIL, are not recommended for use with AMSOIL gear oil.

AMSOIL Severe Gear is compatible with most limited-slip differentials. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.

No additional limited slip additive should be needed with Severe Gear in most applications but if you would like to be sure order the ADA-TB-EA for a 4 ounce tube.

Bobby Unser talks about Severe Gear


If you feel you don't fall into the severe gear category such as you are not hauling heavy loads, your differential is not subjected to heavy abuse to include a lack of cooling as SUV's experience. Try our "Long Life" 75W90. This was designed for over the road trucking which use larger sumps operating significantly cooler and the fluid is needed to hold it's EP qualities for longer time.

For passenger car performance the Severe Gear 75W90 may also be over-kill. Save some money with AMSOIL's AGL 80W90 Synthetic Gear Lube. Now available in low cost gallon jugs. It's perfect for front differentials on 4WD vehicles.

See complete up to date details on the AMSOIL Severe Gear line-up (PDF) with this printable data sheet.

Typical Technical Properties

AMSOIL SEVERE GEAR® Synthetic Extreme Pressure (EP) Lubricant 75W-90 (SVG)

Brookfield Viscosity, cP @-40°C

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)


Flash Point °C (°F) (ASTM D-92)

206 (403)

Pour Point °C (°F) (ASTM D-97)

-48 (-54)

Copper Corrosion (ASTM D 130) 1b Max @ 121 °C (250°F) / 3hr


Falex Procedure B (ASTM D 3233) (failure load, lbf.)


Foam Stability (ASTM D 892)



Give us a call and LET US ADD THIS TO THE REST OF YOUR ORDER. PHONE ORDERING SAVES you money!! 800-579-0580

AMSOIL is continually researching methods to enhance its already-superior product line. New additive technology has recently been incorporated into the Severe Gear® Synthetic EP Gear Lube line, providing even greater protection and performance. While users may notice the fluid color has changed slightly, the previous and new formulations are compatible and may be mixed.
Pricing remains unchanged, providing even greater value.

In 2007, AMSOIL subjected Severe Gear 75W-90 Synthetic Gear Lube and
a number of competing gear lubes to a comprehensive series of industry-standard tests. While some lubes performed well in some areas and poorly in others, Severe Gear placed near the top in all performance categories. It revealed itself to be the most well-balanced formula for its time, capable of providing exceptional performance and protection in a range of applications.

Since then, AMSOIL gear lube technology has advanced, making an already superior product stronger. As the results show, the new additive technology allows Severe Gear to outperform the previous formulation and all of its competitors as tested in 2007. AMSOIL has raised the bar for gear lube performance even higher.

Increased Extreme-Pressure

High-horsepower/high-torque applications demand lubricants with increased extreme-pressure (EP) properties. The Falex Extreme-Pressure Test (ASTM D-3233) is used to determine a lube’s ability to provide EP protection. As Chart 1 shows, although the previous formulation ranked in the top tier, the new technology provides an 80 percent increase in EP protection and easily outperforms all competing formulations from A Study of Automotive Gear Oils.

Beyone Amsoil's prior already industry leading antiwear properties under load. Mobil 1 and Lucal run of the mill.

Increased Wear Protection

Severe applications such as towing, hauling and racing subject gear lubes to severe conditions, causing fluid film rupture in lesser lubricants. Metal-to metal contact can result, inviting rapid wear and, ultimately, gear failure.
The 4-Ball Load Wear Index Test (ASTM D-2783) determines a gear lube’s anti-wear properties under heavy load.
Higher values, reported as the Load Wear Index (LWI), indicate increased wear resistance. As demonstrated in Chart 2, the new formulation provides a 14 percent higher value than the previous formulation and ranks higher than all scores achieved in 2007 testing.

Load Wear Index

The technology behind the entire line of Severe Gear Synthetic EP Gear Lubes also provides increased foam control, thermal and oxidative stability, limited slip differential chatter suppression and torque retention.

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