Free Catalog

Dealers Needed

Buy AMSOIL at Wholesale Prices
Become A Preferred Customer

Frequently Asked Questions

Satisfied Customers

Motorcycle Products

Motorcycle Oils

Motorcycle Air/Oil Filters

Motorcycle Suspension Fluids

Motor Oils

Racing Motor Oils

Diesel Oils

Oil Filters

Air Filters

2-Cycle Oils

4-Stroke Oils

Gear Lubricants

Racing Gear Lubricants

Transmission Fluids

Fuel Additives

Brake Fluid

Power Steering Fluid


Hydraulic Oils

Compressor Oils

Wiper Blades

Spark Plugs/Wire Sets




Industrial Products

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?


To order a free catalog | Click here |

To buy AMSOIL products, visit the AMSOIL Online Store

| Buy AMSOIL at wholesale prices |

Buy AMSOIL By Phone from AMSOIL Headquarters
7am-5pm Central Time, Toll-Free at: 1-800-777-7094

Give Operator Sponsor # 504006
For Fastest Service

Buy AMSOIL at Wholesale Prices AMSOIL Synthetic Gasonline Motor Oils AMSOIL Synthetic Diesel Motor Oils
AMSOIL Synthetic European Motor Oils AMSOIL Synthetic Racing Motor Oils AMSOIL Synthetic Motorcycle Motor Oils
AMSOIL Synthetic 2-Stroke Motor Oils AMSOIL Synthetic 4-Stroke Motor Oils AMSOIL Synthetic Tansmission Fluids
AMSOIL Synthetic Gear Lubes AMSOIL Synthetic Greases AMSOIL Synthetic Hydraulic Oils
AMSOIL Synthetic Compressor Oils AMSOIL Gasoline Fuel Additives AMSOIL Diesel Fuel Additives
AMSOIL Filtration Products AMSOIL Other Products Buy AMSOIL at Wholesale Prices

Which AMSOIL Products Are Recommended For Your Vehicles?

| Click Here And Enter Your Vehicle Information To Find Out |

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 oil 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.

Today's engines are running hotter than ever. More horsepower, turbo chargers and aerodynamic styling have created extremely hot environments that receive less cooling from outside air. High heat leads to oil oxidation, deposits and thickening in conventional oils. Because they are made from impure, irregular molecules, conventional motor oils are more susceptible to the effects of heat. The small, light molecules in conventional oil tend to evaporate as the oil is heated, leaving large, heavy molecules behind and leading to oil consumption and an increase in the oil's viscosity. If those large, heavy molecules are chemically unstable, they may also break-down and form deposits on component surfaces, further inhibiting the release of heat into the oil stream.

Even in relatively mild temperatures, oxygen works to break down some of the chemicals in conventional lubricants. The extreme heat in engines actually promotes oxidation. When conventional oil contaminants break down, they coat components with varnish, deposits and sludge and leave the lubricant thick, hard to pump and with very poor heat transfer ability.

Cold temperatures cause oil to thicken. Conventional lubricants contain paraffins which cause them to thicken in cold temperatures as the paraffin gels. At startup, this can leave working parts unprotected for as long as five minutes while the oil warms to a temperature that allows it to flow.

Dust and dirt from the air enter the engine through faulty air cleaners, some oil fill caps and crankcase ventilation systems. Normal engine wear produces small metal particles that are picked up and circulated by the oil. The abrasive particles of road dust and dirt increase the rate of wear and generate larger metal particles. Those particles are equally abrasive and the rate of wear accelerates with a snowball effect. While filtration removes most of these contaminants, some remain and are left to circulate with the oil.

Combustion produces several byproducts that also act as contaminants. Water and acids lead to sludge, rust and corrosion. Soot and carbon create sludge and varnish and can clog filters. Unburned fuel in liquid form is deposited on cylinder walls where it leaks past the rings into the crankcase. Sludge deposits collect on oil pump screens, limiting the flow of oil to vital engine parts and resulting in rapid and destructive wear. When oil becomes contaminated, its viscosity changes. With soot, dirt, oxidation or sludge, viscosity increases; with fuel dilution it decreases.

Engines create a great deal of internal pressure. Extreme pressure can result in boundary lubrication which breaks the oil film between moving parts. Movement inside the engine agitates the fluid, trapping air and forming bubbles or foam. Because air is compressible, the ability of the fluid film to prevent contact is reduced. and because the mixed air contains oxygen, it promotes oil oxidation.

Careful research and experimentation led lubricant manufacturers to specific chemicals that combat various problems faced by motor oils. These chemical additives are added to base oils as a package. Typical additive packages can include rust and corrosion inhibitors, detergents, dispersants, antifoaming agents, oxidation inhibitors, extreme pressure additives and viscosity index improvers. Each additive is designed to aid the base oil in the protection of components, but additives have their limitations.

While these additives are created to perform specific tasks, they are also subjected to the same extreme environment experienced by the base oil, and each additive is affected by different variables in different ways. For example, viscosity index improvers are used to reduce the thinning effects caused by operation at elevated temperatures. They are the key components that allow for the production of multigrade oils. However, the long molecules in viscosity index improvers are subject to shearing in service, which reduces their ability to minimize fluid viscosity loss. Permanent shearing of viscosity index improvers can result in piston ring sticking due to deposit formation, increased oil consumption and accelerated equipment wear.

High quality additives perform best and last longer when paired with high quality synthetic base oils.

Conventional lubricants are made from refined petroleum, a naturally occurring and impure substance. The variety and non-uniform size and shape of the molecules that make up conventional oils lend themselves to contamination. They cannot withstand extreme heat or cold, and they burn off and sucumb to oxidation, leading to the development of deposits and component wear.

AMSOIL Synthetic Motor Oils provide extended equipment life, reduced maintenance costs, better performance, improved fuel economy and extended drain intervals through the use of high-quality synthetic base stocks and superior additive packages.

Because they are derived from pure chemicals, synthetic lubricants contain no unnecessary molecules. Their smooth lubricating molecules slip easily across one another, improving the lubricants ability to reduce friction, which in turn improves wear control, heat control and fuel efficiency. In addition, uniformly sized synthetic lubricant molecules resist thinning in heat and thickening in cold, decreasing the need for viscosity index improvers and increasing the lubricants ability to maintain its viscosity.

Because AMSOIL synthetic lubricants contain only strong, uniform molecules, they are much more resistant to thermal and oxidative breakdown. AMSOIL synthetics are virtually impervious to breakdown at normal operating temperatures and can be used in higher temperatures than conventional oils without breaking down. AMSOIL Synthetic Motor Oils keep components free of varnish, deposits and sludge.

Not only do AMSOIL Synthetic Motor Oils provide protection that is superior to conventional oils, but they remain fit for service many times longer as well. Heat and oxidation are the main enemies of lubricant base stocks. The excellent resistance of synthetic lubricants to thermal and oxidative breakdown allows them to be safely used for much longer drain intervals than conventional lubricants. Their uniform and smooth molecular structure allows AMSOIL Synthetic Motor Oils to operate with less friction and better heat control than conventional lubricants.

When AMSOIL motor oil was introduced in 1972 it was ahead of its time. Today, engine designers have goals of increased fuel economy, reduced exhaust emissions, more performance out of smaller engines and greater durability, increasing the demands placed on motor oils and requiring continuous upgrades. AMSOIL remains at the forefront of the engine oil market by continuing to provide oils that are ahead of their time. No other motor oil is guaranteed for 25,000 miles or one year in normal service, and no other motor oil can match the performance and protection provided by AMSOIL Synthetic Motor Oils.

| See More AMSOIL Performance Tests |

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.

AMSOIL Product Information

Use This Form to Get Exclusive Technical Articles and Information on AMSOIL Products.

Receive valuable weekly newsletter by email - please complete this form.

Personal contact information will only be used to provide requested information or assistance. You will not be enrolled in advertising or marketing programs and your information will not be sold.

You will only receive the email newsletter.

Which AMSOIL Products Are Recommended For Your Car or Truck?
| Click Here And Enter Your Vehicle Information To Find Out |

What Drain Interval Does AMSOIL Recommended For Your Vehicle?
| Click Here For The AMSOIL Recommended Drain Interval Chart |

I welcome the opportunity to work with you personally as your servicing AMSOIL Dealer. Use the information on this website to contact me. You may also check out the AMSOIL Corporate Website for product and business opportunity information.

If you would like more information about AMSOIL INC., click one of the links below: