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Motor Oil Test and Comparison

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

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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Two-Stroke Specifications Differ Greatly From Their Four-Stroke Counterparts

While Lubricity Is Key, Cleanliness And Deposit Control Are Also Priorities In Two-Stroke Oils.

Dan Peterson, Vice President, AMSOIL Technical Development

Len Groom
Technical Product Manager,

Most people know two- and four-stroke engines have different lubrication require-ments, but many don't know why. The differences in lubrication requirements are a direct result of the differences in the two- and four-stroke combustion processes.

Four-stroke engines common in auto-motive applications are continuously lubricated by a single source of filtered oil. Two-stroke engines, however, are lubricated by oil that is consumed during the combustion process. In addition, combustion occurs on every revolution of the crankshaft in a two-stroke application, compared to every-other revolution in a four-stroke engine, which generates more heat and places greater demand on the lubricant. The oil burned in the two-stroke combustion process can leave deposits on the piston crown, skirts and ring grooves. Two-stroke oil must be formulated to burn as cleanly as possible and control deposit formation; excessive deposits can result in engine failure. The high heat and tendency for deposit formation in two-stroke engines necessitate an oil with excellent lubricity, detergency and ability to prevent pre-ignition.

Lubricity describes an oil's friction-reduction properties. Lubricity is critical for managing the excess heat and high operating rpm common in two-stroke engines. High heat is generated not only from the rapid combustion process, but also from piston-to-cylinder friction. Two-stroke applications require a lubricant that withstands the heat. If the oil burns off too easily from combustion or does not provide the needed lubricity for piston lubrication, piston scuffing will occur, causing lost performance and even engine failure.

Detergency describes a lubricant's ability to control engine deposits. In two-stroke engines, deposit control is especially important on the piston skirt and ring areas in order to prevent ring jacking and ring sticking. Ring jacking occurs when deposits accumulate behind the piston rings and force them against the cylinder Wall, rupturing the lubricant film. ring sticking is caused by deposit formation on the top and bottom of the ring within the ring groove that prevents the ring from forming a proper seal in the cylinder. If a proper seal is not formed, gases and heat from the combustion process can escape past the piston and burn the protective lubricant off the cylinder wall. This is known as blow-by which, again, results in piston scuffing, lost performance and even engine failure. A quality two-stroke oil must contain enough detergency to prevent engine failure from ring jacking and ring sticking.

Prevention of pre-ignition in the combustion chamber is important for efficient two-stroke operation. If the by-products of burned fuel and oil accumulate inside the combustion chamber, deposits can build on top of the piston (the crown). Piston crown deposits can absorb heat from the burning fuel and oil, creating hot spots that can ignite the fuel/oil mixture before the spark plug fires, which is known as pre-ignition. Pre-ignition can cause the temperatures and pressures in the combustion chamber to rise beyond the failure limits of the piston and head gasket, resulting in catastrophic engine damage. Ultimately, prevention of pre-ignition requires a lubricant carefully formulated with the proper detergent additives in the right amounts for effective deposit control.

The three areas identified - lubricity, detergency and prevention of pre-ignition - are critical to engIne operation. There are other areas of importance too, including exhaust port deposit control to keep exhaust valves functioning, fluidity for oil injection systems, miscibility for mixing oil with gasoline at cold temperatures and rust protection for storage. specifications are in place to help consumers choose the right oil for their applications. Two-stroke specifications are developed and managed by multiple governing bodies, including the Japanese Automobile Standards Organization (JASO), the International Standards Organization (ISO) and the National Marine Manufacturers Association (NMMA). The American Petroleum Institute (API) also haS a specification for two-stroke engine oils. Most of these organizations have adopted standards focused on lubricity, detergency and prevention of pre-ignition.

Of the current two-stroke specifications, NMMA TC-W3 is probably the most well-known. It was developed by marine engine manufacturers for water-cooled outboard engines; however, it has been deemed appropriate for other two-stroke engines by many manufacturers of land-based two-stroke engines. API TC is a long-standing specification that applies to air-cooled engines, which may include those with a radiator. JASO and ISO two-stroke specifications apply to air-cooled engines commonly found on handheld power equipment.

AMSOIL products are tested to ensure they not only meet, but surpass the demands of the engine and operating environment for which they are developed. We recognize the importance of performance and reliability, which is why we engineer our two-stroke oils with high-quality chemistries to exceed industry standards and address specific demandS of various two-stroke applications. In general, AMSOIL DOMINATOR is ideal for two-stroke racing applications; AMSOIL INTERCEPTOR is ideal for two-stroke recreational equipment; hp Injector and Saber Outboard are ideal for two-stroke marine equipment; and Saber Professional is ideal for handheld power equipment. For specific product recommendations and specifications, consult the AMSOIL 2-Cycle Chart (G1988). Published, AMSOIL Magazine 12/11.

AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oils are formulated to meet the latest API SN Resource Conserving and ILSAC GF-5 industry specifications. AMSOIL Signature Series Oils include 0W-20, 0W-30, 5W-30 and 10W-30 and represent the very best motor oils AMSOIL has to offer, allowing motorists to take advantage of maximum extended drain intervals. AMSOIL Signature Series Synthetic Motor Oils are recommended for drain intervals of up to 25,000 miles/one year, whichever comes first (15,000 miles/one year in severe service conditions).

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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.



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AMSOIL Synthetic Diesel Oil Articles and Testimonials

"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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