Why Harley Owners choose AMSOIL
Wear Test Comparison - AMSOIL vs. Harley Screamin'Eagle
- 20W-50 Amsoil Motorcycle Oil Test -
The recent introduction of Screamin' Eagle® Synthetic Lubricant by Harley Davidson® indicates the Motor
Company has finally recognized the benefits of running synthetic motorcycle
oil in their air-cooled engines. After years of advising dealers and
customers to avoid using synthetic oils in their bikes, it's natural to
wonder why the company is suddenly marketing one.
For the past 20 years, Harley-Davidson® has claimed its petroleum-based
Genuine H-D Oil is best for the "unique requirements of Harley-Davidson®
air-cooled V-twin engines." However, laboratory testing has consistently
revealed that Genuine H-D Oil does not provide the best protection possible
for Harley-Davidson® engines. In fact, Four-Ball Wear Tests show
Harley-Davidson® 20W-50 Motorcycle Oil leaves a wear scar over 50 percent
larger than that left by AMSOIL Synthetic 20W-50 Motorcycle Oil.
One of the major benefits of running a synthetic motorcycle oil is its resistance to oxidation and
thermal degradation, which inhibit the formation of sludge and deposits that
contribute to increased wear. In the past, Harley-Davidson® has defended use
of its Genuine H-D Oil by arguing that oil breakdown in extreme heat is a
non-issue because extreme heat conditions are not normally faced by
motorcycle engines, while the superior cold-temperature benefits of
synthetics also don't apply to Harleys.
The fact is, engine oil in Harley-Davidson® motorcycles is subject to very
high temperatures. Being air-cooled, Harley-Davidson® engines get especially
hot while idling in traffic, commonly reaching temperatures up to 240
degrees Fahrenheit. As heat and oxidation increase, so does viscosity,
adversely affecting the lubricating qualities of the oil and increasing
The water, soot and acid byproducts of combustion also contribute to deposit
formation. Harley-Davidson® has stressed the importance of regular oil
changes in order to remove these contaminants. Of course, promoting regular
oil changes is also a good way to promote using petroleum-based Genuine H-D
Oil. High-quality synthetic oils formulated with high-performance additives
effectively withstand such contaminants, allowing motorcyclists to safely
extend drain intervals.
In support of their about-face and the introduction of a synthetic oil,
Harley maintains that "the Motor Company has never supported the use of
synthetic products in our vehicles because there has never been any test
validations completed on the numerous formulations in HD/Buell motorcycles.
This product has been exclusively designed for Harley-Davidson® and is the
only synthetic product TESTED and CERTIFIED by Harley-Davidson® engineering
for use in HD/Buell motorcycles." The
Great Oil Debate was an article
written for American Iron magazine
regarding synthetic oils and addresses the debate over using synthetic oil in
Although this is necessary marketing hype, Harley-Davidson® V-twin
air-cooled engines are not unique in their lubrication requirements and do
not require a special Harley-only fluid(see letter from Harley-Davidson). There is nothing about Screamin'
Eagle® Synthetic Motorcycle Oil that sets it apart from, or makes it better
than, many other synthetic motorcycle oil formulations, except that
Harley-Davidson® is marketing it and directly profiting from the sales.
According to Harley-Davidson®, one of the unique benefits offered by
Screamin' Eagle® Synthetic Motorcycle Oil is its versatility. For the first
time the company is recommending an oil that can be used in the engines,
primary chaincases and transmissions of most Harley-Davidson® motorcycles,
including Evolution XL, Evolution 1340, Twin Cam 88 and 88B, Revolution and
Buell models. This feature, however, is not unique. AMSOIL 20W-50 Synthetic
Motorcycle Oil may also be used in the engines, primary chaincases and
transmissions of these applications, providing superior lubricating
protection in each component.
How does Screamin' Eagle® Synthetic Motorcycle Oil measure up to AMSOIL in
wear protection? Four-BallWear Test results
indicate that AMSOIL Synthetic Motorcycle Oil still provides the best
protection possible for motorcycles. In fact, Screamin' Eagle®
Synthetic Motorcycle Oil leaves a wear scar nearly 80 percent larger than
AMSOIL 20W-50 Synthetic Motorcycle Oil.
Not only does AMSOIL Synthetic Motorcycle Oil offer
greater wear protection than Screamin' Eagle© Synthetic Motorcycle Oil, it
also delivers greater value. Suggested retail price of Screamin' Eagle® is
nearly $2 a quart higher than AMSOIL 20W-50 Motorcycle Oil. And because
AMSOIL Synthetic Motorcycle Oil may be used for extended drain intervals of
up to twice the manufacturer's suggested interval, while Screamin' Eagle® is
recommended for standard drain intervals. AMSOIL customers realize
Harley-Davidson® claims Screamin' Eagle® Synthetic Motorcycle Oil has been
"exclusively designed" for use in their motorcycles, pointing to extensive
bench testing and over 230,000 miles of durability testing to back it up.
AMSOIL INC. has 30 years of experience providing superior lubricating
protection for all brands of motorcycles, and AMSOIL Synthetic Motorcycle
Oils have been tested in millions of over-the-road miles. Testimonials from
countless motorcyclists further demonstrate the superiority of AMSOIL
Synthetic Motorcycle Oils.
Formulated with top-of-the-line synthetic base stocks and high-temperature
deposit control additives, AMSOIL Synthetic Motorcycle Oils provide superior
protection and performance for motorcycles in all operating conditions.
AMSOIL Motorcycle Oils effectively withstand oxidation and thermal
degradation, keep wear to an absolute minimum, hold contaminants in
suspension and keep engines running cool and clean.
AMSOIL Synthetic Motorcycle Oils:
Reduce operating temperatures.
Keep engines clean and deposit-free.
Provide maximum protection against wear.
Formulated without friction modifiers for smooth performance.
Saves money with extended drain intervals of up to two times the manufacturers' recommendations.
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.