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Motor Oil Test and Comparison

AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

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Temperature Extremes Call For Superior Motor Oils

Why Harley-Davidson Owners Choose AMSOIL

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AMSOIL Synthetic Gear Lube Outperforms Valvoline Gear Lube

8.2% More MPG With AMSOIL Synthetic Lubricants

AMSOIL Proves Superior In Clark County Field Test

AMSOIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil is Correct Choice for Jeff Foster Trucking

AMSOIL Products Improve Efficiency and Reduce Operating Costs for Gerlach Trucking

What is the Noack Volatility Test?

What is the Four-Ball Wear Test?

What is TBN?


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Gear Oil Market is Heating Up

Gear oil has been a hot topic around the industry lately. Vehicle manufacturers, field testers and lubricant manufacturers all are weighing in on the evolution of differentials and its effect on gear oil performance and design. With the recent release of the of the AMSOIL A Study of Automotive Gear Lubes white paper, the spike in awareness regarding the need for superior gear oil performance could not have come to a better time for AMSOIL Dealers.

Raising Awareness

Most consumers are unaware of how important differential maintenance has become. It is the gear lubricant's job to lubricate, cool and protect geared systems. It must also carry damaging wear debris away from contact zones and muffle the sound of gear operation. These tasks have become increasingly difficult with the demands placed on modern differentials, especially in pickups and SUVs. Consumers want more towing capacity, more torque, longer drain intervals and maximum fuel economy.

In addition, most vehicles operate under severe service as defined by vehicle manufacturers, but the majority of vehicle owners are unaware of this. Severe service applications include towing, hauling, plowing, off-road use, frequent stop-and-go-driving, steep hill driving and temperature extremes. How prevalent is severe service operation? A September 2007 Lubes 'N' Greases article entitled "Torque & Spark" notes that more than 90 percent of Ford Super Duty pickups are used for towing. That means that more than 90 percent of Super Dutys operate in severe service and require superior gear lubrication.

Gaining Momentum

In recent years, studies have revealed that 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. Severe service operation causes additional stress to the differential during the break-in period and can cause premature differential damage or failure. This revelation, along with the marked increase in the ratio of horsepower to differential size, helped to bring differential maintenance to the forefront. 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. In fact, many auto manufacturers now recommend an initial drain interval of between 500 and 3,000 miles. Most consumers are unaware of this recommendation.

Severe Service Remains a Big Challenge

Harold Chambers, a lubrication technology specialist with Ford Transmission & Driveline Engineering, is quoted in Lubes 'N' Greases as saying, "One of the biggest challenges for our vehicles is towing. We also need to run quietly for the life of the vehicle. We want to optimize the power density - that is, get the maximum torque capability with the least fatigue life in the smallest space possible."

Chambers also lists fuel economy and heat generation as major obstacles, both adversely affected by severe service.

"Overall, because of higher durability and towing needs, we're seeing more wear and distress issues with gear sets," said Chambers.

AMSOIL Answers the Call

Today's driveline challenges depend upon gear lubricants to supply solutions. As clearly demonstrated in the gear lube white paper, A Study of Automotive Gear Lubes, AMSOIL answers the call with Severe Gear Synthetic EP Gear Lubes. When pitted against 13 of the industry's most popular gear lubes, AMSOIL Severe Gear came out on top, performing well in every category. AMSOIL Severe Gear proved robust enough to maintain its viscosity when subjected to temperature changes. It was durable enough to retain viscosity during use, even during severe service. It proved superior in resisting oxidation, protecting against wear, resisting foaming and providing protection under extreme pressures. AMSOIL Severe Gear ranked first or second in 13 out of 16 tests and never ranked below fourth, the only gear lube to test so well. The high ranking of AMSOIL Severe Gear clearly points to a well balanced formulation capable of delivering effective, long-lasting lubrication protection to all differential components. Most notable is the superior performance of AMSOIL Severe Gear in the critical areas of extreme-pressure protection and viscosity and oxidation stability.

The Extra Mile

To further verify the findings reported in A Study of Automotive Gear Lubes, additional testing was performed on AMSOIL Severe Gear. The L-37 Axle Rig Test evaluates load carrying, wear protection and extreme pressure properties of gear lubricants. Already considered a rigorous test, the severity of the test was increased to challenge Severe Gear to the absolute limits in gear lube performance. Following a gear conditioning phase, the test is normally conducted for 24 grueling hours at 80 wheel rpm, 1740 lbf-ft torque per wheel with an axle sump temperature maintained at a constant 275 degrees F (135 degrees C). To further challenge the integrity of AMSOIL Severe Gear Synthetic 75W-90, the test severity was increased by adding 20 percent greater load. Under these test conditions, Severe Gear was tested at 2088 lbf-ft per wheel for a total combined load of 4176 lbf-ft. This is equivalent to a Chevy pickup with a Duramax 6.6 liter engine and Allison transmission pulling a loaded trailer uphill at full throttle in second gear for 24 straight hours. AMSOIL Severe Gear passed all the requirements, even under 20 percent greater load.

Severe Service Requires Severe Gear

Without a doubt, AMSOIL Severe Gear Synthetic Gear Lubricants provide superior, worry free protection, even in severe service. For a complete look at indisputable proof, download a copy of A Study of Automotive Gear Lubricants.



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Premium AMSOIL Synthetic Motor Oils offer the longest drain intervals on the market, unsurpassed protection and performance that effectively extends equipment life and improved fuel economy, saving customers money at the pump and reducing the nation's dependence on foreign oil.

"AMSOIL INC. warrants that the use of its lubricants will not cause mechanical damage to any mechanically sound equipment when AMSOIL INC. products are used in full compliance with the company's recommendations and instructions."


AMSOIL synthetic motor oils are formulated to surpass engine test specifications, offering protection far greater than competing motor oils for extended drain intervals. Most synthetic oil manufacturers make no claim to extended drain intervals, deferring to the maintenance schedule provided by the vehicle manufacturer. With its unparalleled oil and warranty program, AMSOIL offers consumers unprecedented protection and economics.

Another AMSOIL First

More than 20 years ago, AMSOIL began using the NOACK volatility test as a comparison tool and measurement of quality. Back then, nearly every oil tested side-by-side with AMSOIL synthetic motor oils failed, and those that passed barely squeaked by. Other oil companies paid no attention to NOACK results until Ford Motor Company made it a requirement for service fill oils, validating what AMSOIL had said all along.

THE NOACK Volatility Test
The NOACK Volatility Test determines the evaporation loss of lubricants in high temperature service. The more motor oils vaporize, the thicker and heavier they become, contributing to poor circulation, reduced fuel economy and increased oil consumption, wear and emissions. AMSOIL Synthetic Motor Oil resists high temperature volatization better than other motor oils. AMSOIL Synthetic Motor Oil maintains peak fuel efficiency and reduces oil consumption and emissions.

AMSOIL Now An ISO Certified Manufacturer
AMSOIL recently received ISO 9001:2000 certification of our Quality Management System (QMS). NSF International Strategic Registrations is the registrar that has verified our QMS meets the requirements of the ISO 9001:2000 standard, the most widely utilized quality standard throughout the world for quality management systems. ISO standards are used by over 300,000 companies worldwide setting rigorous standards for businesses, government and industry.

ISO 9001:2000 is applicable to any manufacturing and service organization providing a framework for system development that focuses on the customer, quality system performance and ongoing improvement. AMSOIL received ISO 9001:2000 registration under the scope: synthetic lubricants blending, packaging, and other fulfillment directly associated with lubricant product.

The ISO certification puts AMSOIL in line with some of the most efficient companies in the world. It is further assurance that the products and services AMSOIL provides will continue to maintain the high level of quality the company always demanded.

AMSOIL Product Information

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