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Synthetic Formula 4-Stroke 10W30/SAE30 for Commercial Grade Engines by AMSOIL

New Amsoil ASE for Small Commercial EnginesFormula 4-Stroke® 10W-30/SAE 30 Synthetic Small Engine Oil (ASE)

A commercial grade formulation designed for hot temperature, severe service operation of small engines where routine maintenance is often difficult or infrequent. Recommended for use wherever SAE 10W-30 or SAE 30 oil is specified in gasoline or diesel engines, transmissions, hydraulics, and chain cases requiring the listed specifications. Applications include maintenance equipment, tractors, lawn and garden equipment, generators, compactors, pumps, light towers, welders, log splitters, power washers, cement mixers and trowels, skid-steers, excavators and compressors.

Printable Data Sheet on the AMSOIL Small Engine Oil

Call for Pricing or to Place an Order
(cost less than OEM synthetic re-labels)

Package sizes include: 1-Quart Bottle;
1-Quart case (12 quarts); 30 and 55-Gallon Drums


AMSOIL Formula 4-Stroke® Small Engine Oil (ASE) is a robust formulation designed for hot temperature, severe service operation of small engines where routine maintenance is often difficult or infrequent. It is formulated with premium synthetic base oils that exceed both 10W-30 multi-grade and SAE 30 straight-grade viscosity requirements. Unlike conventional SAE 30 motor oils, AMSOIL ASE has a naturally high viscosity index and does not contain paraffin (wax). It has a -38°F pour point and qualifies for SAE 10W, making it an "all season," multi-grade lubricant with a wide operating temperature range. As an SAE 30 weight motor oil, AMSOIL ASE provides outstanding protection for hot operating engines. Formula 4-Stroke® Small Engine Oil is a commercial grade lubricant that helps improve productivity and reduce maintenance costs through superior engine protection.

How can a multi-viscosity work as a mono-viscosity?

Please see the Technical Service Bullitin Titled: Viscosity of Monograde and Multigrade Oils on this very subject why our 10W30/SAE-30 is the best for your specific needs calling for the old streight weight.

Bobcats run hot, expensive to maintain. AMSOIL offers the new ASE as the solution.Resists Heat and Reduces Oil Consumption
AMSOIL engineered Formula 4-Stroke® Small Engine Oil to withstand the high temperatures of hard working engines. It effectively resists oxidation and oil vaporization to control oil thickening and reduce oil consumption. AMSOIL ASE lasts longer in service than conventional oils and keeps engines clean for peak operating efficiency.

Excellent For Transmission Systems
AMSOIL Formula 4-Stroke® Small Engine Oil is a shear stable formulation that contains no friction modifiers. It will not break down during rigorous mechanical activity, making it ideal for hydraulic or hydrostatic systems and chain cases. It is wet clutch compatible and designed to prevent clutch slippage in commercial or recreational transmissions. AMSOIL Formula 4-Stroke® Small Engine Oil protects gears and bearings during high-demand, commercial duty service.

Primary application is garden and lawn tractors.Superior Protection
Motor oil temperatures in automotive applications typically run around 210 degrees F, while oil temperatures in continually operating compact engines can easily top 300 degrees F. These elevated operating temperatures promote oil consumption and oil thickening and can significantly reduce the life of the oil. The combination of elevated oil consumption and infrequent maintenance can lead to low oil levels, placing further stress on the remaining oil, while reducing engine performance and increasing the chances for engine failure. Infrequent operation of these engines can be just as damaging. Acids generated during operation and water from condensation can build up in the oil during inactivity, promoting corrosion and rusting of internal engine components.

Recognizing the stress severe operating conditions place on small engine lubricants, many engine manufacturers are beginning to recommend synthetic oils for use over a broad range of ambient conditions. As a commercial grade lubricant, it meets the demands of homeowner, commercial and industrial applications, improving productivity and reducing maintenance costs through superior engine protection.

* “Air cooled engines run hotter than automotive engines.  The use of non-synthetic multi-viscosity oils (5W-30, 10W-30, etc.) in temperatures above 40*F (4*C) will result in higher than normal oil consumption.” -
Source - Briggs & Stratton owners manual, Model series 90000, 100000, 2004

AMSOIL Formula 4-Stroke® Small Engine Oil is formulated with high levels of premium anti-wear and detergent additive technology. It provides severe service protection of pistons, bearings and gears and effectively neutralizes acids from combustion by-products prone to small engines. Anti-rust additives further protect equipment during storage or infrequent use.

Applications and Recommendations
AMSOIL Formula 4-Stroke® Small Engine Oil is recommended for use wherever SAE 10W-30 or SAE 30 oil is specified in gasoline or diesel engines, transmissions, hydraulics and chain cases that require the following:

  • API SL, SJ, SH, SG...(Gasoline)
  • API GF-4, CF, CD (Diesel)
  • JASO MA/MA2, ISO-L-EMA2 (Wet Clutch)

Engine manufacturers include - Briggs & Stratton, Kohler, Honda, Tecumseh, Robin, Kawasaki, Onan, Kohler, Kubota, Yanmar, Wisconsin, Power Train, Vanguard and Linemar.

Equipment brands include - Toro, Ariens, Sears Craftsman, John Deere, MTD, Bolens, Dixie Chopper, Yard-Man, Coleman, Murry, Troy-Bilt, Ex-Cell Generac, Snapper, Simplicity, Ingersoll, Wheel Horse, Homelite, Porter Cable, Devilbass, Everride, Poulan, Cambell, Hausfeld, Massey Ferguson, Thomas, Bobcat, Kubota, New Holland and Caterpillar.

Applications include - Maintenance equipment, tractors, lawn and garden equipment, generators, compactors, pumps, light towers, log splitters, welders, power washers, cement mixers and trowels, skid-steers, excavators and compressors.

Tecumseh 150 hour endurance test

Tecumseh 150 hour endurance test. How well does your oil hold up at a constant 290 degrees?

Developed within the compact engine industry, the Tecumseh 150-hour endurance test measures a lubricant’s ability to function in continuous operation applications and severe operating conditions common to engines in the field. Operating speed is maintained at a constant 3,200 RPMs, while average oil temperature is 283 degrees F, average intake air temperature is 103.5 degrees F, average cylinder head temperature is 570.9 degrees F and average exhaust temperature is 1256.4 degrees F.

Many try - Few succeed!

Oil sump tested at completely clean (#10) merit rating. Valve Spring Housing scored 9.7!
  • 65% Less Oil Consumption
  • 88% Less Oil Thickening
  • 48% Less Average Wear
  • No ring sticking & completely free of deposits. Rated a TEN in cleanliness.
  • Full Synthetic Base
  • Gas and Diesel Performance
  • Versatile - One product
  • Stable - Protection against Viscosity Loss at High Temperatures
Ring condition absolutely clean (10 merit rating). Piston skitrts 9.7 and 9.6 (anti-thrust and thrust sides). Piston under crown and cylinder wall = 7.


"This is one of the most versatile AMSOIL products in years. Ideal for operations who subject their 4-stroke engines to heavy loading, extended operations, want to benefit from extended life and performance, want to reduce the # of products needed for several diesel and gas motors and want to decrease fuel and maintenance costs."

AMSOIL ASE 10W30/SAE-30 cost less than most other suitable AMSOIL engine oils and for Commercial accounts can be purchased for less than $3.50 per quart.

Excellent for:

  • Home owner
  • Lawn Care Services
  • Small Engine Repair Centers
  • Agriculture Customers
  • Construction Companies
  • Golf Courses
  • Highway Maintenance
  • Equipment Rental Businesses
  • Users of Emergency and Rescue Equipment
  • Amusement Parks


AMSOIL Formula 4-Stroke® Small Engine 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.

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

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 800-579-0580. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.



 FORMULA 4-STROKE® 10W-30/SAE 30 Synthetic Small Engine Oil (ASE)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)

Pour Point °C (°F) (ASTM D-97) -39 (-38)

Flash Point °C (°F) (ASTM D-92)

236 (457)

Fire Point °C (°F) (ASTM D-92)

256 (493)

Four Ball Wear Test
(ASTM D-4172B: 40 kg, 75°C, 1200 rpm, 1 hour), Scar, mm


Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

High Temperature/High Shear @ 150°C and 1.0 X 106 s-1, cP (ASTM D 4683), cP 3.25
Total Base Number 8.4


Small-Engine Drain Intervals

With the performance and expectations of AMSOIL products, there seems to be something missing in the small engine interval recommendation. Why only the OE drain interval? I have numerous small engine customers who put who put many hours a year on their air compressors, water pumps, generators, welders, etc. With my personal experience and testing over the years, I am convinced it would be possible to go three to five times the OE drain interval in these applications. We have vehicles going up to eight times the OE drain interval, so why not more on small engines? Hopefully, this is possible in certain applications. Thanks for all the great products.

Orlie Yoder

AMSOIL: Because small engines are often air-cooled and power a wide variety of applications with different operating conditions and sump sizes, it is impossible to recommend an extended drain interval. Instead, recommendations are made for the lowest common denominator or worse case scenario. Many applications you mentioned can go beyond OEM drain interval recommendations based on oil analysis, but they must be controlled and monitored.


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