The Original Synthetic Oil
All Service Oil
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Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO)
Unsurpassed Protection for Scooter Engines, Transmissions and Gear
Boxes
Package sizes include:

Quart Bottle
Quart Bottles (case of 12)
AMSOIL Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO) is formulated specifically to meet
the special needs of today’s high-tech air- and water-cooled fourstroke motorized scooters,
offering unsurpassed wear protection and friction reduction for longer equipment life and cooler
provides additional protection for transmissions and gear boxes, while its friction modifier-free
operating temperatures. Its exceptional shear stability ensures consistent viscosity protection and
formulation ensures wet clutch compatibility and smooth clutch operation. A special anti-corrosion
additive package provides long-term protection during periods of inactivity and storage.

Shear Stability
High engine rpms common to scooter applications increase shear, causing conventional lubricants
to lose viscosity and reduce their ability to control wear, resulting in shorter engine life. The
synthetic formulation of Formula 4-Stroke Synthetic Scooter Oil effectively resists shear, delivering
consistent viscosity protection for unsurpassed wear protection and extended equipment life.

Thermal Stability
The operating temperatures of scooter engines fluctuate greatly, especially with air-cooled
engines. Formula 4-Stroke Synthetic Scooter Oil resists breakdown at elevated temperatures,
maintaining its protective viscosity for maximum wear control.

Transmission and Gear Box Compatibility
In many scooter applications, the engine and transmission and/or gear box share the same oil
reservoir. Formula 4-Stroke Synthetic Scooter Oil is absolutely shear stable and will not thin out
from mechanical activity, providing superior protection for transmissions and gear boxes.

Wet Clutch Compatibility
Some scooters utilize a frictional clutch to engage and disengage the engine from the drivetrain. In
many cases, this clutch is immersed in the same oil used in the engine and transmission. Formula
4-Stroke Synthetic Scooter Oil contains no friction modifiers and is wet clutch compatible, offering
smooth clutch operation and increased clutch life.

Rust and Corrosion Protection
Scooters are often subjected to extended periods of inactivity and storage, exposing the
equipment to internal rust and corrosion. Formula 4-Stroke Synthetic Scooter Oil is formulated
with a special anti-corrosion additive package designed to provide long-term protection during
periods of inactivity and storage.

Applications and Recommendations
AMSOIL Formula 4-Stroke Synthetic Scooter Oil is recommended for use wherever SAE 10W-40
motor oil is specified in air- and watercooled four-stroke motorized scooter engines, transmissions
and gear boxes that require the following:

  • API SG, SL/CF
  • JASO MA/MA2 (motorcycle wet clutch)

Engine manufacturers include, but are not limited to, Honda, Kawasaki, Suzuki, Yamaha, Vespa,
Aprilia, Piaggio, Benelli, Vento, Kymco, Tank and TGB.

Service Life
Follow the equipment manufacturer’s recommended drain intervals.

Mixing AMSOIL
AMSOIL Formula 4-Stroke Synthetic Scooter Oil is compatible with conventional and synthetic
motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil life expectancy
and reduce the performance benefits. Aftermarket oil additives are not recommended for use with
AMSOIL motor oils.

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 upon request at 763.257.3130. Keep Out of Reach of Children. Don’t pollute. Return
used oil to collection centers.
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
14.7
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
94.3
Viscosity Index (ASTM D-2270)
162
Pour Point °C (°F) (ASTM D-97)
-38 (-36)
Flash Point °C (°F) (ASTM D-92)
232 (450)
Four Ball Wear Test
(ASTM D-4172B: 40 kgf, 75°C, 1200 rpm, 1 hr), Scar, mm
0.40
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
 
High Temperature/High Shear Viscosity
(ASTM D 4683 @ 150°C, 1.0 X 106 s.-1), cP
4.12
Total Base Number
7.4

Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO)
Copyright 2008 All Service Oil  All Rights Reserved