
PRODUCT DESCRIPTION
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 operating temperatures. Its exceptional shear stability ensures consistent viscosity protection and provides additional protection for transmissions and gear boxes, 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.
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:
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.
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TYPICAL TECHNICAL PROPERTIES |
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Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO) |
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14.7 |
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94.3 |
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Viscosity Index (ASTM D-2270) |
162 |
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Pour Point °C (°F) (ASTM D-97) |
-38 (-36) |
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Flash Point °C (°F) (ASTM D-92) |
232 (450) |
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Fire Point °C (°F) (ASTM D-92) |
250 (482) |
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Four Ball Wear Test |
0.40 |
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Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
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5.4 |
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High Temperature/High Shear Viscosity |
4.12 |
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Total Base Number |
7.4 |
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 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

A heavy duty spray lubricant fortified with special rust and corrosion inhibitors. Penetrates and adheres to metal surfaces, leaving a long lasting protective coating. Apply MPHD to any metal surface that requires a heavy duty lubricant or is exposed to the damaging effects of salt, moisture or chemical corrosion. Works as an undercoat, leaving a wax-like film. Recommended for motorcycle chains. Won't "sling" off. Dry to the touch. Doesn't attract dust. It is ideal for hinges, wire ropes and springs, nuts and bolts, motorcycle or bicycle chains, and for undercoating car doors, wheel wells, rocker panels, seams and other metal surfaces exposed to water, dirt or road salt.

AMSOIL Metal Protector (AMSOIL MP) is a synthetic, greaseless all-purpose lubricant that provides metal surfaces with a long-lasting film. It forms no gum or sludge. Its penetrating agents cut through rust and corrosion to allow free movement of hardware parts. Dries electrical and ignition systems, and protects all electrical equipment from moisture, including salt water. Effective in applications as diverse as hardware, household appliances, sporting goods and electrical equipment. No silicone or harmful chemicals.
Product Code: AMP

Product Code: AMW
Try Miracle Wash and Polish on:
RV's
Bicycles
Motorcycles
Boats
Kitchen Appliances
Countertops
Windows
Mirrors
Desktops
Musical Instruments


Perfect for use on surfaces which may be damaged by conventional lubricants such as grease or oil. Protects with a dry lubricating film. Helps prevent the cracking and drying of rubber. Displaces water and makes an excellent mold release lubricant. May be used where light duty or silicone lubricants are recommended.
Product Code: ALS
Formulated for use on metal-to-nonmetal or nonmetal-to-nonmetal contact surfaces
Leaves a dry lubricating film
Helps prevent rubber cracking and drying
Displaces water
Excellent mold release lubricant
USDA H-1 rated
Point and spray convenience


Cleans entire combustion intake system for improved engine performance. Removes gum, varnish and carbon deposits for better fuel economy and improved overall engine performance. Cleans intake valves, intake manifolds and throttle plates to keep the combustion intake system running at peak efficiency. Effective in both two-cycle and four-cycle engines. Product Code: APF
Performance Features
| Ea Motorcycle Air Filters (EaAM) AMSOIL has brought Nanofiber technology to the motorcycle market. AMSOIL Ea Motorcycle Air Filters hold 15 times more dust than a wet gauze type filter. Their nanofiber media removes 5 times more dust than traditional cellulose filters and 50 times more dust than wet gauze. |
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See Pricing Information or Place an Order |
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Nanofiber Basics
Because the nanofibers in AMSOIL Ea Motorcycle Air Filter media are so small, there are more pores per square inch, allowing for higher dirt-holding capacity and lower pressure drop compared to traditional filter medias. Thinner media fibers produce more uniform pore size distribution, improving the filter’s overall ability to capture and retain particles.
Air Filtration Basics
An engine requires air for combustion, but the air drawn in through the induction system is loaded with contaminants. There are over 400 tons of suspended dirt and other contaminants in a cubic mile of air over a typical city. The concentration can be even higher in rural areas where there is frequent travel on unpaved roads. The dirt and contaminants drawn into an engine from the air are the leading causes of engine wear.
The function of the air filter is to trap and hold these wear causing contaminants without restricting air flow. As the filter traps more and more contaminants, air flow becomes restricted, smothering the engine and diminishing performance. The more wear causing contaminants a filtration media traps and holds, while still allowing optimum air flow, the better the filtration media.
The nanofiber technology used in AMSOIL Ea Filters surpasses all other technology in efficiency, capacity and service life. With AMSOIL Ea Air Filters, dust and submicron particles remain on the surface and are trapped in the nanofibers, preventing particles from lodging in the filter media depth. This produces higher efficiency and higher capacity, extending engine and filter life and reducing engine wear.
Ea Motorcycle Air Filters
The filtration media in the Ea Motorcycle Air Filter is pleated and has epoxy-coated wire on the face and back of the media for additional strength and stiffness. High quality plastisol potting compounds bond the pleat packs to the plastic or aluminum side plates. The S&S (aftermarket engine and carburetor manufacturer) style round filters are manufactured with high-quality plastisol that bonds the media to the wire backing and sealing area.
Superior Filtration
The synthetic nanofiber media featured in AMSOIL Ea Motorcycle Air Filters have sub-micron diameters and small inter-fiber spaces, resulting in more contaminants being captured on the surface of the media and lower restriction. Cellulose, wetted gauze and foam filters have larger spaces between the media that cause contaminants to load in the depth of the filter, resulting in airflow path plugging, higher restriction and lower capacity.
Cleanable for Long Service Life
AMSOIL Ea Motorcycle Air Filters are cleanable, providing unsurpassed protection and long service life. AMSOIL Ea Motorcycle Air Filters should be cleaned every year or according to operating conditions. Operation in extremely dusty or dirty environments may require more frequent cleaning. Ea Motorcycle Air Filters should be changed every four years.
Cleaning Instructions
AMSOIL Ea Motorcycle Air Filters are cleaned in the same manner as AMSOIL Ea Air Filters for cars and light trucks: with a vacuum or shop air. To clean with a vacuum, place the filter on a flat surface and carefully vacuum the filter media on the dirty side where the incoming airflow enters the filter. To clean with shop air, hold the filter with one hand and carefully blow the filter media at a 45-degree angle on the clean side of the filter using low-pressure (15 to 20 psi) shop air. Using too much air pressure will damage the filter media.
Superior Alternative
AMSOIL is producing an initial offering of eight Ea Motorcycle Air Filters manufactured for the most popular Harley Davidson models from the years 1988 to 2006, including motorcycles equipped with S&S carburetors and air cleaner housings.
Application information can be found in the online power sports lookup, in the G2135 Power Sports Application Guide or proper filters may be determined when placing orders.

No matter what kind of riding you do, there's an AMSOIL EaOM Motorcycle Oil Filter that's right for your bike or ATV.
Look Up the AMSOIL EaOM Oil Filter for your Motorcycle or ATV
See product application notes for Harley Davidson Motorcycles at bottom of page
Oil is the life blood of your motorcycle engine. Your oil filtration system keeps that life blood flowing and your ride on the road.
For nearly 30 years, AMSOIL INC. has offered state-of-the-art products Dealers can sell with pride. In that time, the company's reputation has grown, along with its product line.
Now, AMSOIL has developed a full line of oil filters specifically designed for motorcycles and ATVs.
The SuperDuty Motorcycle Oil Filters (SMF) reflect the newest technological advances in the quest to meet the unique demands of today's high-stress motorcycle engines.
The three main functions of any oil filter are flow, life and efficiency.
While each of those functions is vital individually, there's more to it.
"Remember, it's more than just flow. It's more than just efficiency. It's more than just life," said Dave Anderson, AMSOIL Technical Sales Director. "They all have to perform in unison. A filter is only as good as its weakest link."
Typically, oil filters are comprised of cellulose, or paper, synthetic fibers, glass fibers, or a combination of media.
"All of these fibers have a different set of characteristics to them," Anderson said.
Each provides different levels of filtration of the damaging dirt and dust particles that shorten the life of a motorcycle engine.
Flow is gained through a media that is open and free, while efficiency is gained through media that is closed and difficult to penetrate. The flow versus efficiency " compromise within the filtration system is the greatest demand on an oil filter's performance.
"Through our testing, we have found the best for motorcycles, and automobiles, is a blend of the three media - synthetic, cellulose and glass," Anderson said.. "That gives the best overall performance. You have to look at overall performance. How they do all the tasks that you want them to do. A prudent consumer must consider the total package."
AMSOIL SuperDuty Motorcycle Oil Filters provide the greatest possible balance of that "total package" to provide the ultimate in overall filtration performance.
The filters are available in black finish, with several models also available in chrome. The chrome models have a C designation.
They have a heavy-duty case of drawn steel. The case is double-crimped at the base with rolled-under seaming to withstand extreme pressure surges and road shocks.
AMSOIL SMF are available in spin-on and cartridge types.
The new G-194 Automotive Filter and Cross- Reference Guide lists the correct filter for each motor- cycle and ATV. A separate Motorcycle and ATV Filter Cross Reference Guide, G-1768, at $1.00 U.S., also is newly available for your convenience.
These quality full-flow filters are designed to allow extended filter change intervals.
AMSOIL INC. recommends the following guidelines. When using an AMSOIL SMF with conventional oil, change the filter at the manufacturer 's recommendation. When using an AMSOIL SMF with AMSOIL Motor Oil, change the filter at twice the manufacturer 's recommendation or six months.
| Harley Davidson Motorcycles Crankcase requiring 20W50 lubricant; Harley Davidson part numbers 99903-93 and 99896-88, use the AMSOIL High Performance Synthetic 20W-50 Motorcycle Engine Oil, product code AMV. Transmission requiring 75W90 lubricant; Harley Davidson part numbers 99892-84 and 98853-96, use the AMSOIL Series 2000 Synthetic 75W90 (AGR/TGR) Gear Lube, product code TGR. Chain Case Oil (primary) lubricants requiring 10W40; Harley Davidson part number 99887-84, uses the AMSOIL High Performance Synthetic 10W40 Motorcycle Engine Oil, product code AMF. The exception is the Sportster. It has two oil reservoirs instead of three and uses the same oil in both reservoirs. Use AMSOIL 20W50 Synthetic Engine Lubricant in both reservoirs, product code AMV Note: The AMSOIL 20w50 (AMV) and 10W40 (AMF) Motorcycle Engine Oils do not contain friction modifiers and meet Harley Davidson specification for the wet clutch system. Harley-Davidson forks that recommend type "E" or "B" fork oils, use the AMSOIL Shock Therapy Suspension Fluid, product code STM Harley Davidson air filter part numbers, 2900252, 29002-52A, 29002-57, 29002-58, and 29036-56 uses the AMSOIL, product code TS-77 |