Harley-Davidson/AMSOIL Oil Chart
AMSOIL 20W-50 Synthetic Motorcycle Oil is a premium oil designed for
those who demand the absolute best lubrication for their motorcycles.
It is the result of extensive research and is specially formulated to excel
in all areas unique to motorcycles, including high temperatures of air-cooled
engines such as Harley-Davidson® V-Twin, wet-clutch lubrication,
extreme-pressure regions of gears and chains and rust common
to short trips and storage. AMSOIL Synthetic Motorcycle Oil is multifunctional
and fulfills the requirements of both domestic and foreign motorcycles.
AMSOIL, the leader in synthetic lubrication, produced
the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive
experience of AMSOIL, The First in Synthetics,® to do the best job protecting your
Withstands Extreme Heat
To prove its extreme-heat performance,
AMSOIL 20W-50 Synthetic Motorcycle
Oil was installed in a 2012 Harley-Davidson
FXDB Dyna Street Bob motorcycle.
After deactivating the electronic temperature
controls to increase severity, the
engine was subjected to extensive idle
time broken by short bursts of engine
revving to simulate the intense heat conditions
of a rally or parade route. Despite
little air flow and cylinder temperatures
reaching more than 500°F, the oil maintained
viscosity and delivered outstanding
protection (see graph).
Reduces Wear and Deposits
AMSOIL Synthetic Motorcycle Oil
contains a heavy treatment of anti-wear
additives to reduce wear regardless of
the operating conditions. It is thermally
(heat) stable and contains maximum
levels of oxidation inhibitor additives.
AMSOIL Synthetic Motorcycle Oil is
extremely resistant to breakdown and
engineered to prevent damaging sludge
and carbon deposits for superior engine
Quality Protection for Gears
With AMSOIL Synthetic Motorcycle
Oil, there is no need for separate
transmission or primary chaincase
lubricants. It is absolutely shear stable
and will not thin out from mechanical
activity. AMSOIL 20W-50 Motorcycle Oil
performs like a gear lube without the
negative effects of extreme-pressure
additives. In the FZG gear test, AMSOIL
achieved a perfect score with a "zero"
Delivers Superior Rust Protection
Motorcycles are prone to rust from
storage, humidity and short drives.
Rust can cause major damage such as
roller bearing failure, uncontrolled wear,
compression loss and blow-by. Good
rust protection, however, comes by
design and is not natural to engine oils.
Unlike many motorcycle oils, AMSOIL
Synthetic Motorcycle Oil contains special
anti-rust agents. It passes the ASTM
D1748 humidity cabinet rust test,
demonstrating superior rust protection.
Provides Excellent Wet-Clutch Performance
AMSOIL Synthetic 20W-50 Motorcycle Oil contains no friction
modifiers and promotes smooth shifting and positive clutch
engagement. It controls heat and helps prevent slippage and
glazing, while its high TBN helps improve clutch life by
resisting the acids that can degrade clutch material.
AMSOIL 20W-50 Synthetic Motorcycle Oil is recommended for
air- or liquid-cooled four-stroke engines. It meets SAE 90, API
GL-1 gear oil requirements and is recommended for transmissions
and primary chaincases. AMSOIL 20W-50 Motorcycle Oil
is recommended for Harley-Davidson®, Buell®, KTM®, Ducati®,
Aprilia®, BMW®, Triumph® and other motorcycles where 15W-50
or 20W-50 engine oils or SAE 90, GL-1 gear oils are used. Not
recommended where an API GL-4 or GL-5 gear oil is required.
AMSOIL 20W-50 Synthetic Motorcycle Oil is compatible with
other conventional and synthetic motor oils; however, mixing
oils may shorten the oil’s life expectancy and reduce its
performance benefits. AMSOIL does not support extended
drain intervals where oils have been mixed. Aftermarket oil
additives are not recommended for use with AMSOIL Synthetic
Recommended for use up to twice the motorcycle manufacturer
change interval (miles/hours) or one year, whichever comes
first, in engines, transmissions and primary chaincases. For
Big Twin Harley-Davidson transmissions only, follow the Harley-Davidson recommended drain interval for synthetic oil of up to
20,000 miles or one year, whichever comes first. When using
an engine filter other than AMSOIL Ea®, change the filter at
For off-road use, change AMSOIL 20W-50 Synthetic Motorcycle
Oil at motorcycle manufacturer-recommended intervals.
Racing or modified engines are excluded from extended
drain interval recommendations. Oil changes are at the
HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended
application and according to the recommendations in the Material
Safety Data Sheet (MSDS). An MSDS is available via the Internet at www.amsoil.com
or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute.
Return used oil to collection centers.
For warranty information, visit www.amsoil.com/warranty.aspx.
TYPICAL TECHNICAL PROPERTIES
SAE 20W-50 Synthetic Motorcycle Oil (MCV)
Kinematic Viscosity @ 100°C, cSt (ASTM D445)
Kinematic Viscosity @ 40°C, cSt (ASTM D445)
Viscosity Index (ASTM D2270)
Pour Point °C (°F) (ASTM D97)
Flash Point °C (°F) (ASTM D92)
High Temperature/High Shear Viscosity (ASTM D5481 @ 150°C , 1.0
x 106 s-1), cP
Four Ball Wear Test (ASTM D4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour),
FZG (ASTM D5182), Load Stage Pass (Wear in mm)
13 (0 mm)
Noack Volatility, % weight loss (g/100g) (ASTM D5800)
Foam (ASTM D892, Sequence I, II & III)
Shear Stability Kurt Orbahn (ASTM D6278), % viscosity change 120
Rust Test - Humidity Cabinet (ASTM D1748)
No Rust, Pass
Total Base Number
For More Technical Information, Click Here to Download the Product Data Bulletin