Formula 4-Stroke Synthetic Scooter Oil (ASO)

Amsoil Formula 4-Stroke Synthetic Scooter Oil (ASO)
Data Bulletin 

Product Highlights

Meets the needs of today’s high-tech air- and water-cooled four-stroke motorized scooters. Unsurpassed wear protection and friction reduction for longer equipment life. Protects transmissions and gear boxes. Wet-clutch compatible to insure smooth clutch operation. Provides long-term protection during storage.

AMSOIL Formula 4-Stroke 10W-40 Synthetic Scooter Oil is formulated specifically to meet the special needs of today’s high-tech air- and water-cooled four-stroke motorized scooters, offering outstanding wear protection and friction reduction for longer equipment life and cooler operating temperatures. Its exceptional shear stability provides consistent viscosity protection and additional protection for transmissions and gearboxes, while its friction-modifier-free 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.

Package Sizes (ASO)

Code Sizes Units
ASOQT (ASOQT-EA) Quart Each
ASOQT (ASOQT-CA) Quart Case of 12

Shear Stability

High engine rpm common to scooter applications increases 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 outstanding wear protection and extended equipment life.

Thermal Stability

Scooter engine operating temperatures fluctuate greatly, especially in 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 gearbox share the same oil reservoir. Formula 4-Stroke Synthetic Scooter Oil is shear stable and resists thinning from mechanical activity, providing superior protection for transmissions and gearboxes.

Wet-Clutch Compatibility

Some scooters employ 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 is wet-clutch compatible. It contains no friction modifiers, 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.

  • Protects against wear
  • Resists shear for excellent gear protection
  • Delivers smooth clutch operation
  • Applications and Recommendations

Use wherever SAE 10W-40 motor oil is specified in air-and water-cooled four-stroke motorized scooter engines, transmissions and gearboxes recommended for any of the specifications below, including those made by Honda*, Kawasaki*, Suzuki,* Yamaha*, Vespa*, Aprilia*, Piaggio*, Benelli*, Vento*, Kymco*, Tank* and TGB*.

  • API SG, SL/CF
  • JASO MA/MA2 (motorcycle wet clutch)
  • ISO-L-EMA2

Service Life

Follow the equipment manufacturer’s recommended drain intervals.

Compatibility

AMSOIL Formula 4-Stroke Synthetic Scooter Oil is compatible with other synthetic and conventional motor oils. Mixing AMSOIL motor oil with other oils, however, will 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 motor oils.

WARRANTY SECURE®

Outboard Synthetic 2-Stroke Oil is Warranty Secure, keeping your factory warranty intact. Outboard Synthetic 2-Stroke Oil is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the Amsoil Limited Warranty (G1363). For details, visit www.amsoil.com/warrantysecure.

TYPICAL TECHNICAL PROPERTIES 2-Stroke (ASO)
Amsoil Injector Oil
Kinematic Viscosity @ 100°C, cSt (ASTM D445) 14.6
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 96.7
Viscosity Index (ASTM D2270) 157
Fire Point ˚C (˚F) (ASTM D92) 250 (482)
Pour Point °C (°F) (ASTM D97) -40 (-40)
Flash Point °C (°F) (ASTM D92) 238 (460)
High-Temperature/High-Shear Viscosity, cP (ASTM D5481) 4.2
Noack Volatility, % weight loss (ASTM D5800) 5.4
Total Base Number 8.5

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