Severe Gear 75W90 Gear Lube GL5

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

Severe Gear 75W90 Gear Lube GL5Formulated for the severe operating conditions of today’s pick-up trucks, SUVs, heavy equipment and other hard working vehicles. Hypoid Gear.

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.

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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)

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Product Description

New EZ Squeeze differential packs
The SEVERE GEAR easy pack eliminates the hassles of changing gear lube

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.


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.


See the Updated PDF on the Severe Gear line of gear oils. Print and save!

Product PDF


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.

Performance Features

  • Superior Film Strength
  • Controls Thermal Runaway
  • Rust and Corrosion Protection
  • Helps Reduce Operating Temperatures
  • Maximum Efficiency
  • Long 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 Severe Gear oils.

AMSOIL Severe Gear is compatible with conventional and synthetic gear oils. Mixing AMSOIL gear oil 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.


This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). An MSDS is available via the Internet at or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute.

For warranty information, visit

Gear Lube Reviews!


Easy-Packs are a Game Changer!

By  Nick,  a  Verified Buyer  on  January 24, 2024
I was able to change my differential fluid in about 30min on jacks stands thanks to the Easy-Pack. Very smart packaging and quality product as always from Amsoil.

Great Stuff.

By  Bob,  a  Verified Buyer  from  Scottsdale AZ  on  January 23, 2024
I am using this for extreme drag racing. Its used in the differential in my Jeep Trackhawk. It seems to work well. I like that the traction control additive in it already. The easy pack packaging is handy. ONE full pack is just the right amount. Its best not to fill too much. If your racing, change diff oil with your oil changes, until it stays clear.

Works great!

By  MOE,  a  Verified Buyer  on  January 14, 2024
Used it on a 2019 Mazda 3 to replace the transfer case and rear differential fluid. And vehicle feels a lot better!! I only use Amsoil for my vehicle.
Editior Note- We get this one most often here in our AMSOIL store:

Superior differential oil!!

By  DAVE,  a  Verified Buyer  from  Wilmington, Delaware  on  January 14, 2024
I’ve been a mechanic for 35 years.. I have used basically every oil on the planet.. I put this fluid in the front and rear differential of my wife’s 2017 Toyota forerunner. After a few days she said, what did you do to my car? It seems more quiet. Just for total discretion. I also used signature motor oil when I did the oil change also. I believe Amsoil is the superior product than any of the big companies out there if my wife noticed that’s all I needed to know.


Great product

By  BOYD,  a  Verified Buyer  on  January 14, 2024
Easy package to get anywhere. I added a screw on nozzle and forced all the fluid into my quichchange rear end in a matter of seconds.

Being wise and preventing break downs

By  TIM,  a  Verified Buyer  from  Texas  on  January 10, 2024
As we get older money is hard to come by, wisdom dictates we have to prevent break downs on our vehicles ! Amsoil products are high quality and help prevent costly break downs. The price you pay for amsoil is well worth the cost. God bless.

review 75-90W

By  RAMON,  a  Verified Buyer  from  Hyattsville, Md   on  December 21, 2023

I’m loving this product. I cost me 20 bucks a quart versus GM dealer of their gear oil at 40 a quart. And Amsoil’s recommended servicing is 80k miles, versus GM’s 40k. I just used this to service my rear differential in my 15 Cadillac ATS 2.0L awd.


Bobby Unser talks about Severe Gear

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 GL5 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 Protection

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.

Don’t Overlook Your Differential Maintenance

Severe Gear GL5 Hypoid Gear Lube

Use AMSOIL Severe Gear for ultimate performance and protection.

Motorists know when they’re supposed to change their motor oil. They have oil life monitors, oil change centers and commercials all telling them when it’s time for an oil change. Differential oil changes, on the other hand, often get overlooked. Many people don’t even think of the differential when performing routine maintenance on their vehicles and don’t realize four-wheel drive trucks have two differentials and a transfer case that all require service. In fact, according to one quick lube company, only one to two percent of their customers purchase a differential gear lube change.

Most differential wear occurs during the break-in period. Because differentials are not equipped with filters, break-in metals are suspended in the oil, causing increased wear as the particles mesh between the gears. Hauling heavy loads and towing heavy trailers cause additional stress to the differential during the break-in period and can cause premature differential damage or failure. Changing the gear lube after the break-in period (about 3,000 miles) is a low-cost maintenance investment that provides a significant payoff, including greatly reduced wear, extended differential gear and bearing life and protection for expensive vehicle investments. Auto manufacturers recognize the importance of draining abrasive break-in materials. As seen in Chart 1, some manufacturers recommend an initial drain interval of between 500 and 3,000 miles.

Differential internal components consist of six gears (one pinion, one ring, two side and two spider gears), six bearings (two pinion, two carrier and two axle) and sometimes include a clutch setup for limited slip performance. All of these parts require high quality, clean gear oil in order to perform at an optimal level.

Most pickup trucks, SUVs and vans operate in severe service conditions, including towing, hauling, steep hill driving, commercial use, plowing, racing, off road use, rapid acceleration, frequent stop and- go operation and high ambient temperatures. These severe service operating conditions subject the differential to extreme pressures and operating temperatures.

New vehicles such as turbo diesel trucks and vehicles with V-10 engines boast more horsepower and torque than their predecessors, but differential designs have remained virtually unchanged. Differentials today are subjected to severe duty service and encounter more stress and heat than was seen only a few years ago. Modern gear oils are faced with the challenge of providing adequate wear protection during severe service operating conditions, while also providing maximum fuel efficiency.

“Differential Break-in Oils (OEM) are often Overlooked”

In fact, according to a 2005 SAE paper entitled Breaking the Viscosity Paradigm: Formulating Approaches for Optimizing Efficiency and Vehicle Life, “Concurrent with the strong drive toward better fuel economy, consumers have been demanding increased performance, which has required axle lubricants with enhanced durability protection and lower operating temperatures. There has been a 34% increase in engine horsepower over the last decade, while axle gear sizes have remained constant, sump capacities have been lowered, and drain intervals extended. In the light truck segment there has been a 93% horsepower increase since 1981.”

Differential wear

Further evidence of stress and increased temperatures during the differential break-in period is documented in a 2005 SAE paper entitled The Effect of Heavy Loads on Light Duty Vehicle Axle Operating Temperature. A light duty GM truck towing 14,000 pounds was driven from Orange County, Calif. to the Nevada state line. The test was conducted with both a new axle and a broken-in axle.
Over level ground towing, oil temperature was measured at 230 degrees F in the new axle and 203 degrees F in the broken-in axle. Oil temperature over the most grueling portion of the trip, during which a maximum 6%grade was encountered, revealed the new axle was operating at 350 degrees F and the broken-in axle was operating at 300 degrees F. Laboratory dynamometer test results simulating a truck hauling a trailer provided similar results, with level ground towing temperatures recorded at 266 degrees F with the new axle and 194 degrees F with the broken-in axle and towing temperatures(at a 3.5% grade) recorded at 370 degrees F with the new axle and 295 degrees F with the broken-in axle.

A test on four separate vehicles further demonstrated the importance of changing the factory-fill gear lube within the first few thousand miles. Oil analysis results revealed most of the wear in vehicle one occurred within the first 6,869 miles. Despite higher mileages, vehicles two and three only showed slightly higher iron wear than vehicle one. Vehicle four was the only vehicle which had the factory-fill oil changed to AMSOIL synthetic gear lube, and despite significantly higher mileage than the first three vehicles, it showed a significantly lower level of wear. The chart and photos below provide visual evidence of the wear materials present in the differentials of each vehicle. The photos clearly show that the heaviest amount of wear occurs early in the break-in period. Wear is significantly reduced when the gear lube is changed to AMSOIL synthetic gear lube following the break-in period.