Outstanding Protection for Scooter Engines, Transmissions and Gearboxes. 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.
Package sizes include:
Quart Bottle
Quart Bottles (case of 12)
AMSOIL Formula 4-Stroke Synthetic Scooter Oil is recommended for use wherever SAE 10W-40 motor oil is specified in air and water-cooled four-stroke motorized scooter engines, transmissions and gearboxes that require the following:
• API SG, SL/CF
• JASO MA/MA2 (motorcycle wet clutch)
• ISO-L-EMA2
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.
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.
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.
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.
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.
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.
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.
Follow the equipment manufacturer's recommended drain intervals.
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.
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).
Click here to view the MSDS Data Sheet for AMSOIL ASO.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL TECHNICAL PROPERTIES | |
| Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO) | |
| Kinematic Viscosity @ 100°C, cSt (ASTM D-445) | 14.8 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D-445) | 98.9 |
| Viscosity Index (ASTM D-2270) | 156 |
| Pour Point °C (°F) (ASTM D-97) | -38 (-36) |
| Flash Point °C (°F) (ASTM D-92) | 230 (446) |
| Fire Point °C (°F) (ASTM D-92) | 250 (482) |
| 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) | 5.8 |
| High Temperature/High Shear Viscosity (ASTM D-4683 @ 150°C, 1.0 X 106 s.-1), cP | 4.1 |
| Total Base Number | 7.4 |
Also use AMSOIL Gasoline Stabilizer, in addition to fresh Oil & Filter
Product Name: Small Engine Motor Oils (ASO,ASE)
Current Rating: 4.88out of 5 stars
Votes & Reviews: 8 vote(s) and 19 user reviews.
Reviewed by johnny: 
amazing
Reviewed by Rickiboy:
Very good quality
Reviewed by The repair guy:
I use this oil in my Yamaha majesty 400 amd my Kymco Xciting 500ri. Change it every spring. Never any problems,smooth running engine,no noise,no leaking! You have an exellent product!
Reviewed by Larry:
My wife talked me into buying 2 scooters to putt around the countryside. They are only 49cc engines but since I changed the oil to synthetic they picked up a few miles per hour. I believe synthetic oils are great for any moving metal parts. No wear, No friction, saves money in years to come and makes my engines very dependable.
Reviewed by Jean-Michel:
I have used Amsoil oils for the last 15years on all my toys. Never had a problem. These oils are prime quality at a reasonable price.
You can't go wrong using them!
Reviewed by Kenwood:
I bought a new riding mower and wanted the best oil I could find for it. I found the Formula 4 Stroke small engine oil and liked the fact that it was specifically designed for small engines. This year has been very hot and the grass has grown like crazy so the Amsoil has been put to the test and passed with flying colors. This is the only oil I will put in my mowers from now on.
Reviewed by W:
My mower runs cooler/ quieter and since this oil I don't ever have to add oil between cuts. It's worth Every penny!!
Reviewed by Jack:
Generator
Reviewed by PB:
I use the formula 4 stroke in all my small engine equipment: pressure washer, lawn mower, engine-driven air compressor, brush mower. I feel it's a quality alternative to brands at local parts stores and it gives me peace-of-mind for longer oil change intervals and severe duty service-just as intended.
Reviewed by Shakey:
I bought a new Exmark 24hp Kawasaki engine got 300 hr on it already change it ever 50hr so far not been a hair below full at 50hr yet 👍🏼
Reviewed by WD:
We use Formula 4-Stroke in our commercial lawn mowing business...45 deg F to 100 deg F. It is proving a great oil, no consumption, engines still running like new, and the oil still looks fresh at the OCI. At the 10w rating, it will be fine for cool weather mowing. I'd use the 0w40 formula for severe winter OPE use.
Reviewed by Big guy:
Using on small engines generators lawnmowers and snow blowers
Reviewed by Northeast Homeowner:
I use this oil in my 36 inch walk behind mower, the snow blower and a permanent outdoor standby generator. These small engines are still full on the dipstick at their annual oil changes and the oil looks clean. All of this power equipment is now 10 years old and they are still going strong. Thanks for making such a great product for small engines.
Reviewed by Leonard:
Typical high quality Amsoil product. I use it in my 3 mowers.
Reviewed by None:
I use a soil in all my lawn and garden Equiptment , very happy with it ,without a doubt the best oil there is,
Reviewed by Steve in Tennessee:
I use this oil in my walk behind mower & lawn tractor. One change through the season with about 50 hours on the work horse lawn tractor & the oil is still still clean, I almost feel wasteful when I change it.
However, I know better. I've used Amsoil for the last 12 years & have not been disappointed.
Reviewed by Brian:
I use this oil in riding and push mower with no problems and know its of the same quality as the automotive oil. I've found Amsoil to be a very reliable especially when I lived in the midwest and will continue to run Amsoil is all my vehicles. I give two thumbs up to the Z-Rod oil as well my '62 Galaxie sure likes this oil.
Reviewed by JCD:
Has treated me well in all 4stroke small engine equipment for over a decade. Have a 10+ year old power washer, generator, and lawn mower that are still running as good as new.
Reviewed by Shaun :
Best scooter oil
I have been using this in my 06 Yamaha Vino 125 Cold starting no problem no rough idling everything runs smooth been using it for one year engine temperature for air cooled motor has been extremely improved compared to mobile one Castro royal purple you know the cheap stuff