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Which AMSOIL Products Are Recommended
For Your Vehicles?
Two-Stroke Specifications Differ
Greatly From Their Four-Stroke Counterparts
Lubricity Is Key, Cleanliness And Deposit Control Are Also
Priorities In Two-Stroke Oils.
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
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.
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.
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.
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 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.
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;
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 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
here for more information
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.
The Presidents Desk
Synthetic Diesel Oil Articles and Testimonials
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."
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.
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.
NOACK Volatility Test
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
AMSOIL Now An ISO Certified
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
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.
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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