Amsoil independent dealer
Greg Penrod, Chapel Hill TN.
Home: 931.364.7628 - Cell: 931.993.1677
Pager: 931.323.1371- Email: firstname.lastname@example.org
Amsoil is your full service Synthetic Oil Manufacturer
Wear Test Comparison - AMSOIL vs. Harley Screamin' Eagle
recent introduction of Screamin' EagleŽ Synthetic Lubricant by Harley-DavidsonŽ
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-DavidsonŽ has claimed its petroleum-based Genuine H-D Oil is best for
the "unique requirements of Harley-DavidsonŽ 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-DavidsonŽ engines. In fact, Four-Ball Wear Tests show Harley- DavidsonŽ
20W-50 Motorcycle Oil leaves a wear scar nearly 80 percent larger than that left
by AMSOIL Synthetic 20W-50 Motorcycle Oil.
Four-Ball Wear Test (ASTM D4172), 40kg pressure @ 150
degrees C, 1800 rpm for 1 hour duration
Four-Ball Wear Test is the industry's standard test method for measuring
the wear preventive characteristics of a lubricant. Placed in a bath of
the test lubricant, three fixed steel balls are put into contact with a
fourth ball in rotating contact at preset test conditions. Lubricant wear
protection properties are measured by comparing the average wear scars on
the three fixed balls. The smaller the average wear scar, the better the
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-DavidsonŽ 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
The fact is, engine oil in
Harley-DavidsonŽ motorcycles is subject to very high temperatures. Being
air-cooled, Harley-DavidsonŽ 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-DavidsonŽ
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-DavidsonŽ and is the only synthetic product TESTED and
CERTIFIED by Harley-DavidsonŽ engineering for use in HD/Buell
Although this is necessary
marketing hype, Harley-DavidsonŽ V-twin air-cooled engines are
unique in their lubrication requirements and do not require a special
Harley-only fluid (see letter from Harley-Davidson at bottom of page).
There is nothing about Screamin' EagleŽ Synthetic Motorcycle Oil that sets it
apart from, or makes it better than, many other synthetic motorcycle oil
formulations, except that Harley-DavidsonŽ is marketing it and directly
profiting from the sales.
According to Harley-DavidsonŽ,
one of the unique benefits offered by Screamin' EagleŽ 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-DavidsonŽ 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' EagleŽ
Synthetic Motorcycle Oil measure up to AMSOIL in wear protection? Four-Ball Wear
Test results indicate that AMSOIL Synthetic Motorcycle Oil still provides the
best protection possible for motorcycles. In fact, Screamin' EagleŽ 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' EagleŽ
Synthetic Motorcycle Oil, it also delivers greater value. Suggested retail price
of Screamin' EagleŽ 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'
EagleŽ is recommended for standard drain intervals, AMSOIL customers realize
Screamin' EagleŽ 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.
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
Confirms To AMSOIL That The Use Of Synthetic Motor Oils Other Than
Harley-Davidson Oil Does Not Void Warranty Coverage
January 31, 2003
Dear Mr. Scanlon:
Thank you for your recent letter
requesting information on Harley-Davidson's one-year, unlimited mileage
warranty when Synthetic Lubricants are used.
Until now, the Motor Company has
never supported the use of synthetic products in our vehicles because
there had never been any test validations completed on the numerous
formulations in HD/Buell motorcycles to determine the viability of using
these products on Harley-Davidson products until now.
We have developed a specially
formulated synthetic fluid called SYN3. This fluid can be used in
Harley-Davidson engines, transmissions and primary chaincases. This
product had been exclusively designed for Harley-Davidson and is the
only synthetic product tested and certified by Harley-Davidson
engineering for use on HD/Buell motorcycles.
The use of a
different brand of fluid does not void the one-year, unlimited mileage
warranty unless it can be
confirmed that the use of such products was the cause of the failure.
Thank you, Mr. Scanlon, for taking
the time to write to Harley-Davidson and allowing me to answer your