WHY HARLEY OWNERS CHOOSE AMSOIL BEST
Wear Test Comparison -
AMSOIL vs. Harley Screamin' Eagle

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 wear.
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."
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.
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 additional
savings.
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:
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Reduce operating temperatures. |
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Keep engines clean and deposit-free. |
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Provide maximum protection against wear. |
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Formulated without friction modifiers for smooth
performance. |
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Saves money with extended drain intervals up to two
times the manufacturers' recommendations. |

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