AMSOIL Synthetic Gear Oils
AMSOIL Severe gear is engineered for high-demand applications, including trailer towing, heavy hauling, 4X4 off-road driving, commercial use and racing. Protects gears and bearings from scoring and wear. Excellent cold-flow properties. Outperforms all conventional gear oils. Recommended for all types of vehicles.
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 75w90 EP Synthetic Gear Lube
Product Code
Pkg./Size
SVGQT-EA
Quart Bottle
SVGQT-CA
Quart Bottles (case of 12)
SVG05-EA
5-Gallon Pail
SVG16-EA
16-Gallon Keg
SVG30-EA
30-Gallon Drum
SVG55-EA
55-Gallon Drum
Engineered for high-demand applications, including trailer towing, heavy hauling, 4X4 off-road driving, commercial use and racing. Protects gears and bearings from scoring and wear. Excellent cold-flow properties. Outperforms all conventional gear oils. Recommended for all types of vehicles.
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 75w110 EP Synthetic Gear Lube
Product Code
Pkg./Size
SVTQT-EA
Quart Bottle
SVTQT-CA
Quart Bottles (case of 12)
SVT05-EA
5-Gallon Pail
SVT16-EA
16-Gallon Keg
SVT30-EA
30-Gallon Drum
SVT55-EA
55-Gallon Drum
Engineered for high-demand applications, including trailer towing, heavy hauling, 4X4 off-road driving, commercial use and racing. Protects gears and bearings from scoring and wear. Excellent cold-flow properties. Outperforms all conventional gear oils. Recommended for all types of vehicles.
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 75w140 EP Synthetic Gear Lube
Product Code
Pkg./Size
SVOQT-EA
Quart Bottle
SVOQT-CA
Quart Bottles (case of 12)
SVO05-EA
5-Gallon Pail
SVO16-EA
16-Gallon Keg
SVO30-EA
30-Gallon Drum
SVO55-EA
55-Gallon Drum
SVO27-EA
275-Gallon Tote
Engineered to outperform all conventional gasoline engine motor oils. Reduces heat, friction, and wear for maximum performance and fuel efficiency. Clean engine formula resists high-temp breakdown that forms sludge and varnish. Lasts longer and offers better protection.
Use AMSOIL Extended Drain Synthetic Gear oils in differentials, manual transmissions or other gear applications where one or more of the following standards are specified: API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles, Dana SHAES 256 (Formerly Eaton PS-163) for 500,000 miles, Dana SHAES 429A, Mack GO-J & GO-J+, Meritor 0-76N (75W-90) & 0-80 (80W-140), and Navistar TMS 6816 plus hypoid gear oil specifications from all foreign and domestic manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in rear axles where API Service GL-4 lubricant is recommended.
AMSOIL Long-Life 75w90 Synthetic Gear Lube
Product Code
Pkg./Size
FGRQT-EA
Quart Bottle
FGRQT-CA
Quart Bottles (case of 12)
FGR1G-EA
Gallon Bottle
FGR1G-CA
Gallon Bottles (case of 4)
FGR05-EA
5-Gallon Pail
FGR16-CA
16-Gallon Keg
FGR30-EA
30-Gallon Drum
FGR55-EA
55-Gallon Drum
FGR27-EA
275-Gallon Tote
Engineered for extended drain intervals up to 500,000 miles as set by equipment manufacturers for over-the-road trucks and heavy equipment. Provides long life in passenger cars and trucks. Excellent all season summer and winter performance. Outperforms all conventional gear oils.
Use AMSOIL Extended Drain Synthetic Gear oils in differentials, manual transmissions or other gear applications where one or more of the following standards are specified: API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles, Dana SHAES 256 (Formerly Eaton PS-163) for 500,000 miles, Dana SHAES 429A, Mack GO-J & GO-J+, Meritor 0-76N (75W-90) & 0-80 (80W-140), and Navistar TMS 6816 plus hypoid gear oil specifications from all foreign and domestic manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in rear axles where API Service GL-4 lubricant is recommended.
AMSOIL Long-Life 80w140 Synthetic Gear Lube
Product Code
Pkg./Size
FGO05-EA
5-Gallon Pail
FGO16-CA
16-Gallon Keg
FGO30-EA
30-Gallon Drum
FGO55-EA
55-Gallon Drum
FGO27-EA
275-Gallon Tote
For applications specifying SAE 80W-90 conventional gear lube. Provides improved cold flow properties, high viscosity index and heat resistance. Contains an over-treat of high-quality additives, exceeding the minimum standards. Provides excellent wear protection and long equipment life.
AMSOIL Synthetic 80W-90 Synthetic Gear Lube is recommended for use under various combinations of high-speed, shock loads, low speeds and high torque conditions. It is recommended for use in all light and heavy-duty, automotive, commercial or industrial applications requiring SAE 80W-90 EP gear lube. AMSOIL Synthetic 80W-90 Gear Lube replaces all conventional 80W-90 gear oils and exceeds the lubrication and performance requirements of front and rear differentials, transfer cases, transaxles, manual transmissions, oil lubricated wheel bearings, and steering gear boxes that require any of the following specifications:
API GL-5 & MT-1 MIL-PRF-2105E Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles MACK GO-J Arvin/Meritor 0-76D plus hypoid gear oil specifications from all domestic and foreign manufacturers such as GM, Ford and Daimler Chrysler. Can also be used rear axles where API Service GL-4 lubricant is recommended.
AMSOIL 80w90 Synthetic Gear Lube
Product Code
Pkg./Size
AGLQT-EA
Quart Bottle
AGLQT-CA
Quart Bottles (case of 12)
AGL1G-EA
Gallon Bottle
AGL1G-CA
Gallon Bottles (case of 4)
AGL05-EA
5-Gallon Pail
AGL16-EA
16-Gallon Keg
AGL30-EA
30-Gallon Drum
AGL55-EA
55-Gallon Drum
AGL27-EA
275-Gallon Tote
True marine gear performance. Provides superior protection from shock loading. Resists foam and retains extreme-pressure qualities even when subjected to 10% water contamination. For use in outboard lower units, sterndrives, V-drives, bow and tunnel thrusters and marine transmissions Excellent for use in ATVs.
AMSOIL Universal Synthetic 75w-80w90 Marine EP Gear Oil
Product Code
Pkg./Size
AGMTB-EA
10-Ounce Tube
AGMTB-CA
10-Ounce Tubes (case of 6)
AGMQT-EA
Quart Bottle
AGMQT-CA
Quart Bottles (case of 12)
AGM05-EA
5-Gallon Pail
AGM16-EA
16-Gallon Keg
AGM30-EA
30-Gallon Drum
AGM55-EA
55-Gallon Drum
Formulated with advanced friction modifiers. Eliminates gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, positraction and locking differentials. For use with both synthetic and petroleum gear lubricants and safely replaces manufacturer-recommended friction modifiers.
AMSOIL Slip Lock Limited Slip Differential Additive
Product Code
Pkg./Size
ADATB-EA
4-Ounce Tube
ADATB-CA
4-Ounce Tube (case of 12)
Specifically designed to fit AMSOIL quart, gallon and Twin Pack bottles. Guarantees efficient, quick dispensing of AMSOIL gear oils, transmission fluids and any oil that may need to be pumped. Great for fluid fills in differentials, transmissions, transaxles, boat lower units and boat sterndrives.
A CLOSER LOOK AT GEAR OIL
Automakers continue building vehicles that produce substantially more horsepower, torque and towing capacity than their predecessors, yet the gears and bearings responsible for converting this increased power into wheel rotation remain largely unchanged. To reduce drag and improve fuel economy in some vehicles, engineers have also reduced the volume of gear lube available to cool and protect. The 1996 Ford F-250 Crew Cab, for example, features a 10,500-lb. maximum towing capacity using a rear differential that holds 3.75 quarts of gear lube. The 2011 Ford F-250 Crew Cab, meanwhile, boasts 14,000 lbs. of maximum towing capacity despite a rear differential with a smaller, 3.45-quart capacity.
Increasingly, synthetics are relied upon to meet these higher demands. Some manufacturers now recommend synthetics in the differentials of certain newer vehicles, such as the Chevrolet Silverado and Ram pickup.
Increased Wear Resistance
Differential designs come with inherent suffering points, and it's here that synthetics prove their worth. In a traditional automotive differential (Figure 1), the input pinion gear concentrates intense pressure on the ring gear, forcing it to turn the side and spider gears. As all the gear teeth mesh, they slide against one another repeatedly, separated only by a microscopic film of lubricant. The constant stress the lubricant film bears can shear lesser gear lubes, causing permanent viscosity loss. Once sheared, the fluid film weakens, ruptures and allows metalto- metal contact, leading to increased friction, accelerated wear and eventual gear and bearing failure. The composition and characteristics of synthetics play a vital role in wear reduction, an area in which AMSOIL synthetic gear lubes excel. Conventional lubes formulated with viscosity index (VI) improvers shear more readily under stress. AMSOIL synthetic gear lubes, however, maintain viscosity better than other conventional and synthetic gear lubes despite rigorous use and contain advanced anti-wear additives for further protection.
Extreme-Pressure Additives
Severe-service applications used for towing, hauling, 4x4 off-road driving and commercial use place even greater stress on gears and bearings. Many drivers operate under severe-service conditions without even knowing it. The sliding motion and pressure on gears can wipe the lubricant away, particularly in spiral-cut hypoid gears. AMSOIL Severe Gear® Synthetic EP Gear Lubes contain extreme-pressure (EP) additives that form a durable iron sulfide barrier on gear and bearing surfaces to guard against metal-to-metal contact in the harshest driving conditions.
Increased Operating Temperatures
Differentials have always run hot, but increases in power and torque coupled with reduced fluid volume and reduced airflow due to improvements in vehicle aerodynamics only worsen the problem. Testing has shown applications simulating trailer towing at 88 km/h (55 mph) at a 3.5 percent grade can experience differential temperatures as high as 188ºC (370ºF). Those readings could be even higher using today's more powerful vehicles.
Thermal Runaway
As temperatures in the differential climb, gear lubricants tend to lose viscosity, while extreme loads and pressures can break the lubricant film, causing increased metal-to-metal contact and heat. The increased friction and heat, in turn, cause the lubricant to lose further viscosity, which further increases friction and heat. Friction and heat continue to spiral upward, creating a vicious cycle known as thermal runaway that eventually leads to greatly increased wear and irreparable equipment damage.
Here again AMSOIL synthetic gear lubes outperform conventional gear lubes. Not only do they resist viscosity loss due to mechanical shear, they resist thinning at high temperatures better than conventional lubes. In addition, the deposits conventional gear lubes leave behind coat gears and bearings, inhibiting heat transfer and shortening their life spans. What's more, the lubricant thickens, increasing internal drag and reducing fuel economy.
AMSOIL synthetic gear lubes, however, are engineered in a lab and contain only uniform molecules less prone to volatilizing at high temperatures. As a result, they not only resist thinning in heat to provide better cooling and protective properties, they stay fluid in cold weather to ensure immediate start-up protection. Their uniform molecules also reduce friction, effectively reducing drag and increasing fuel economy.
Extended Drain Intervals
Following the original equipment manufacturer (OEM)- recommended differential drain interval using the OEMrecommended fluid can get very expensive. A 2006 Dodge Ram 1500 (see example below) requires a differential fluid change every 15,000 miles if driven under severe-service conditions, which includes towing, short trips of less than 10 miles and use where temperatures are below 32ºF.
AMSOIL Severe Gear Synthetic EP Gear Lube is recommended for 50,000 miles in severe service. In addition, synthetic gear lubes recommended by OEMs are often more expensive. The lower cost of AMSOIL synthetic gear lubes combined with their extended-drain capabilities and superior performance and protection make them the ideal choice.
Tech tip: AMSOIL Severe Gear Lube 75W-90
New AMSOIL SEVERE GEAR® Easy-Pack - VIDEO
The New AMSOIL Severe Gear® easy-pack helps you easily access tough to reach fill holes. Just open, insert and squeeze.
"While the competition has been formulating their oils down to a price, we have been formulating ours up to the highest performance standards."
--Al Amatuzio--President and CEO, AMSOIL INC.
--Al Amatuzio--President and CEO, AMSOIL INC.
