AMSOIL Formula 4-Stroke® 100% Synthetic Scooter Oil
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.
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Product data sheets
View, download, or save a copy of the Product Data Sheet or Safety Data Sheet for AMSOIL Formula 4-Stroke® 100% Synthetic Scooter Oil.
AMSOIL Formula 4-Stroke 100% Synthetic Scooter Oil
AMSOIL Formula 4-Stroke 100% Synthetic Scooter Oil is a fully synthetic SAE 10W-40 lubricant engineered for the special demands of air- and water-cooled four-stroke motorized scooter engines, transmissions, and gearboxes. The formulation pairs strong shear stability and thermal protection with a friction-modifier-free chemistry, making it the right choice for daily commuters, urban scooter owners, and small-displacement four-stroke riders who want long equipment life and consistent performance from a single bottle.
Shear stability for high-rpm scooter engines
Small-displacement scooter engines spend long periods at high engine rpm, which accelerates oil shear and pulls conventional lubricants out of grade. Once an oil thins below its rated viscosity, the protective film between metal surfaces collapses and wear takes over. The 100 percent synthetic basestocks in Formula 4-Stroke Synthetic Scooter Oil resist mechanical shear, so the SAE 10W-40 grade keeps its film strength run after run for outstanding wear control and longer engine life.
Thermal stability for air-cooled and water-cooled engines
Scooter engine operating temperatures fluctuate sharply, especially in air-cooled designs that depend on airflow at speed to manage heat. Sustained heat soak breaks down weaker oils and leaves harmful deposits on pistons, rings, and valve train surfaces. Formula 4-Stroke Synthetic Scooter Oil resists oxidation and viscosity loss at elevated temperatures, holding its protective viscosity for maximum wear control whether the engine sees stop-and-go city traffic or a long highway pull on a hot day.
Transmission and gearbox protection in shared-sump designs
In many scooter applications, the engine, transmission, and gearbox share a single oil reservoir. That single fluid must lubricate camshafts and bearings, then survive the gear loads of the transmission and final drive, all without thinning. Formula 4-Stroke Synthetic Scooter Oil is shear stable and resists thinning from gear contact, so the same charge that protects the top end also delivers consistent protection for transmissions and gearboxes that share the engine sump.
Wet-clutch compatibility and smooth shifts
Some scooters use a wet frictional clutch immersed in the engine oil to engage and disengage the drivetrain. Adding friction modifiers to that oil causes clutch slip, glaze, and premature wear. Formula 4-Stroke Synthetic Scooter Oil contains no friction modifiers and meets JASO MA/MA2 wet-clutch performance, delivering smooth clutch operation and increased clutch life. The oil is also suitable for use in JASO MB applications, so a single bottle covers both wet-clutch scooters and scooters that do not specify a wet-clutch friction rating.
Rust and corrosion protection for stored scooters
Scooters often sit through long periods of inactivity, in winter storage, between commute seasons, or while a rider is away. Idle engines are exposed to moisture and acidic combustion residues that lead to internal rust and corrosion. Formula 4-Stroke Synthetic Scooter Oil is built with a special anti-corrosion additive package designed to protect bearings, cam lobes, gears, and cylinder walls during long-term storage so the scooter is ready to ride at the start of the next season.
Recommended applications and service intervals
Formula 4-Stroke Synthetic Scooter Oil is intended for air- and water-cooled four-stroke motorized scooter engines, transmissions, and gearboxes that call for SAE 10W-40 motor oil and any of the specifications listed below. The product is engineered for scooter and small-displacement four-stroke models from manufacturers including Honda, Kawasaki, Suzuki, Yamaha, Vespa, Aprilia, Piaggio, Benelli, Vento, Kymco, Hero, Hyosung, Tank, and TGB. Confirm the correct viscosity and service category for the scooter with the AMSOIL Vehicle Lookup Guide.
API service categories: API SP, SN, SM, SL.
JASO MA/MA2 motorcycle wet-clutch performance, suitable for use in JASO MB applications.
ISO-L-EMA2.
Drain interval: follow the equipment manufacturer's recommended drain interval for the engine, transmission, or gearbox application.
Formula 4-Stroke Synthetic Scooter Oil is compatible with other synthetic and conventional motor oils, but mixing shortens oil life and reduces performance benefits, and extended drain intervals are not supported when oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils. Pair the oil with a properly sized scooter or motorcycle oil filter changed at every oil service, and review broader two-wheeler fluid selection in the AMSOIL Motorcycle Oil Guide.
NOACK Volatility, percent weight loss (ASTM D5800)
5.6
Order Formula 4-Stroke Synthetic Scooter Oil
Formula 4-Stroke Synthetic Scooter Oil is available as a quart bottle (product code ASOQT-EA) and as a case of 12 quart bottles (ASOQT-CA). Using AMSOIL synthetic lubricants does not void a new vehicle or equipment manufacturer warranty, and all AMSOIL lubricants are covered by the AMSOIL Limited Warranty. Match the right grade for the scooter with the AMSOIL Vehicle Lookup Guide, review wet-clutch and viscosity guidance for two-wheeled equipment in the AMSOIL Motorcycle Oil Guide, then order AMSOIL Formula 4-Stroke 100% Synthetic Scooter Oil.
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Most modern four-stroke motorized scooters specify an SAE 10W-40 engine oil that meets a current API gasoline service category and, where the model uses a wet clutch, a JASO MA or MA2 wet-clutch rating. Formula 4-Stroke Synthetic Scooter Oil is a fully synthetic SAE 10W-40 that meets API SP, SN, SM, and SL, plus JASO MA/MA2 and ISO-L-EMA2, and it is suitable for use in JASO MB applications. The owner manual is the source of truth for the exact viscosity and service category.
Is this oil compatible with Honda, Vespa, Piaggio, and Kymco scooters?
Formula 4-Stroke Synthetic Scooter Oil is designed for air- and water-cooled four-stroke motorized scooter engines, transmissions, and gearboxes from manufacturers including Honda, Kawasaki, Suzuki, Yamaha, Vespa, Aprilia, Piaggio, Benelli, Vento, Kymco, Hero, Hyosung, Tank, and TGB, as long as the application calls for SAE 10W-40 and one of the listed specifications. Confirm application match using the AMSOIL Vehicle Lookup Guide.
How often should the oil be changed in a 4-stroke scooter?
Drain intervals for Formula 4-Stroke Synthetic Scooter Oil should follow the equipment manufacturer's recommended interval for the engine, transmission, or gearbox application. Severe service such as frequent short trips, heavy idling, dusty environments, or sustained high-rpm riding shortens recommended intervals.
Can regular motorcycle oil be used in a four-stroke scooter?
A four-stroke scooter that calls for SAE 10W-40 with JASO MA or MA2 performance can use a wet-clutch-rated motorcycle oil of the correct viscosity, but a purpose-built scooter formulation matches the shared-sump duty of scooter transmissions and gearboxes more closely. Formula 4-Stroke Synthetic Scooter Oil is shear stable for transmission protection in shared-sump designs and friction-modifier-free for wet-clutch compatibility.
Is Formula 4-Stroke Synthetic Scooter Oil safe with a wet clutch?
Yes. The formulation contains no friction modifiers and meets JASO MA/MA2 wet-clutch performance, supporting smooth clutch engagement, longer clutch life, and consistent shifts in scooters that use a wet clutch. The oil is also suitable for use in JASO MB applications.
Does using AMSOIL synthetic oil void a new scooter warranty?
No. Using AMSOIL synthetic lubricants does not void a new vehicle or equipment manufacturer warranty, and all AMSOIL lubricants are covered by the AMSOIL Limited Warranty.
Can Formula 4-Stroke Synthetic Scooter Oil be mixed with other oils?
The formulation is compatible with other synthetic and conventional motor oils, but mixing shortens oil life and reduces performance benefits, and extended drain intervals are not supported when oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils.
