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AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

AMSOIL Excels in API Sequence IIIF Performance Test

Motor Oil Performance Tests & Comparisons

Temperature Extremes Call For Superior Motor Oils

Why Harley-Davidson Owners Choose AMSOIL

Synthetic Motorcycle Oil & Harley-Davidson Warranty Issues

AMSOIL Synthetic Gear Lube Outperforms Valvoline Gear Lube

Motor Oil Test and Comparison

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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Hot and Cold Temperature Extremes Call for Superior Motor Oils

Hot Temperatures
A significant challenge faced by today's motor oil is maintaining an adequate level of protection during high temperature conditions. Without a quality motor oil protecting it, an engine can be damaged through motor oil breakdown, viscosity increase and deposits - all caused by excessive heat.

NOACK Volatility Test - AMSOIL vs Mobil 1 SuperSynAll motor oils are subject to vaporization when exposed to high heat. How much an oil vaporizes is measured by the NOACK Volatility Test (ASTM D-5800). Conventional motor oils tend to vaporize the most, the lightest fractions evaporating first and leaving behind a thicker, harder-to-pump motor oil. The uniformly sized molecules of synthetic motor oils are much more resistant to vaporization. Less oil evaporates and viscosity remains consistent.

The flash point of a motor oil is the lowest temperature at which application of a flame will cause lubricant vapors to ignite. Higher quality base stocks exhibit higher flash points, and the higher a motor oil's flash point, the better the protection.

AMSOIL motor oils are formulated with high flash points, keeping volatization to an absolute minimum and maintaining their superior protective and performance qualities in extreme heat conditions. In fact, a look at the chart shows AMSOIL 5W-30 Synthetic Motor Oil loses significantly less of its original weight during high-temperature service when compared with competing motor oils.

As motor oils operate in high heat, especially over extended periods, they tend to thin out and lose their ability to provide adequate wear protection. Viscosity Index (VI) indicates the degree of an oil's viscosity change over a given temperature range (between 40° C and 100° C). The higher a motor oil's VI number, the better it is able to maintain its viscosity over a broad temperature range, translating into better wear protection in both hot and cold temperatures. Motor oils with low VI do a poor job of maintaining viscosity in temperature extremes. They are very viscous (thick) at low temperatures, while very thin at high temperatures.

Motor oils formulated with synthetic base stocks usually have naturally high VI numbers, giving them the ability to resist viscosity change in high-temperature operation. Conventional motor oils, on the other hand, require high amounts of viscosity index improvers that increase the relative viscosity of motor oils during high temperature operation. Viscosity index improvers can be thought of as springs, coiling at cold temperatures and uncoiling in high temperatures. Uncoiling makes the molecules larger, increasing internal resistance within the thinning oil and reducing the overall viscosity loss of the fluid.

AMSOIL Synthetic Motor Oils have "ultra high" viscosity indices, allowing them to stay in grade and provide superior wear protection throughout extended drain intervals. In fact, AMSOIL 10W-30 Motor Oil was recently subjected to a triple length API Sequence IIIF Test. Even after being subjected to the test three times longer than the standard length, AMSOIL 10W-30 performed three times better than the standard test limits. The competitor's motor oil showed dramatic viscosity increase in less than half the time.

Viscosity Percentage Increase Test - AMSOIL 10W-30 Synthetic Motor Oil

Oil heated in the presence of air oxidizes, forming damaging acids and deposits. The higher the temperature, the higher the rate of oxidation. Oxidation inhibitors are added to motor oils to minimize the high-temperature deterioration process, while detergents and dispersants minimize the formation of sludge and deposits, neutralize acids and hold solid contaminants in suspension.

AMSOIL Synthetic Motor Oils are formulated with the highest quality additive packages, resisting the damaging effects of heat and oxidation much longer than conventional motor oils and keeping engines running clean and deposit-free.

Cold Temperatures
In order to start effectively, engines must reach a critical cranking speed. As temperatures drop, achieving critical cranking speed becomes more of a challenge. Low temperatures cause motor oils to thicken, and if they thicken too much and impose excessive drag on moving parts, critical cranking speed will not be achieved and the engine will fail to start.

Motor oils used in winter climates must maintain a sufficient low cranking viscosity to allow engine turnover at the lowest temperatures. If a motor oil is able to meet the challenge of allowing the engine to turn over, it immediately faces another significant challenge: providing quick, critical lubrication to the engine's bearings and other moving parts.

Two types of engine pumping failures can result from cold-thickened motor oil: air-binding failure and flow-limited failure. Air-binding failure occurs when the motor oil surrounding the pump inlet screen gets sucked into the pump, but is not replaced by new oil from the sump. The oil pump inlet screen then becomes starved for fluid, and oil pressure becomes erratic as air is entrained and proper oil flow cannot be maintained. Flow-limited failure occurs when the motor oil becomes so thick that it cannot be pumped through the inlet tube and through the narrow passages that deliver the oil to the engine's moving parts.

All motor oils thicken in cold temperatures, but how much they thicken is significant to the level of protection an engine receives. Pour point tests (ASTM D-97) pin-point the temperature at which a motor oil thickens to the point where it ceases to flow. Of course, when oil stops flowing altogether, it is useless. For an engine to receive even minimal wear protection from an oil, it is important it has a pour point lower than typical winter temperatures.

Conventional motor oils face significant challenges in low temperatures because they contain paraffinic (wax) materials. As temperatures drop, the wax components crystallize and agglomerate into large structures. Eventually, the motor oil gels, becomes resistant to flow and fails to provide the engine with the lubrication it needs. In order to hinder the development of these wax crystals, conventional motor oils are additized with polymers known as pour point depressants. These pour point depressants prevent wax crystals from agglomerating and can lower the oil's pour point. In fact, petroleum motor oil without additives typically has a pour point of only around 5° F, but the inclusion of pour point depressants can lower the pour point by approximately 25°.

Synthetic motor oils do not contain the paraffinic material present in conventional motor oils, so they do not require pour point additives. Synthetic motor oils naturally flow at much lower temperatures than conventional oils, maintaining their cold-temperature protection properties over a longer period of time.

Cold weather operation also increases problems associated with condensation. The colder the weather, the longer it takes for the engine to warm to the point where condensation evaporates. During short trips, the engine may not have a chance to evaporate the condensation at all. Eventually, condensation causes acids to form in the oil, causing corrosion.

Rust and corrosion inhibitors serve to neutralize and protect engines against water and acids. These oil-soluble additives have a greater affinity for metal than water, forming a protective film on engine parts. The Total Base Number (TBN) of a motor oil is an indication of how well it combats acids. The higher the TBN number, the greater the degree of protection.

AMSOIL Motor Oils are formulated with high TBN. In fact, AMSOIL 5W-30, 10W-30 and 0W-30 Motor Oils all have TBN's over 11, allowing them to effectively fight acid and corrosion for extended drain intervals.

AMSOIL Synthetic Motor Oils remain fluid in the coldest operating conditions. Maintaining their fluidity and protecting ability in temperatures as frigid as -60° F, AMSOIL not only permits easy engine cranking for quick starts, but flows to critical engine components in a quarter of the time that conventional oils take. Considering that up to 60 percent of all engine wear occurs during cold starts, this immediate lubrication is essential to long-term engine life.

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Why Motor Oil Deteriorates

It is common knowledge that, at some point, engine oil must be changed. It's something that is preached relentlessly to vehicle owners by vehicle manufacturers, quick lubes and oil companies. But consumers are widely unaware of what exactly makes oil changes necessary.

Many factors contribute to a motor oil's demise, but it is essentially the accumulation of contaminants in the oil and chemical changes in the oil itself that make a motor unfit for further service. With time, it is inevitable that the oil will be contaminated by dirt or sludge, or succumb to the extreme pressures or temperatures found inside an engine. AMSOIL Motor Oils are formulated with the industry's most advanced synthetic base stocks and additive packages to combat the forces that deteriorate conventional oils. (read more)

What is the NOACK Volatility Test?
Volatization is a term used to describe what happens to a fluid as it is heated to the point it begins to "boil off." Upon reaching a certain temperature, oil will begin to lose some of its lighter weight molecules as they "boil off" and leave heavier weight molecules behind. Not only does this cause higher oil consumption, this process can also cause increased viscosity making the oil more difficult to circulate through the lubrication system. (read more)

Quality Takes Priority at AMSOIL

The AMSOIL chemical laboratory plays an important role in the daily operations at AMSOIL headquarters. The lab fulfills tech service requests, performs competitor testing and comparisons, and works on the research and development of products at AMSOIL. One of the most important jobs at the lab is quality control. AMSOIL is known for formulating high-quality products and the AMSOIL chemists ensure that everything coming in and going out meets AMSOIL standards. How do they do it? (read more)

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.

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