Amsoil 10W-30 Synthetic Small Engine Oil

SAE 30 commercial motor oil

Formula 4-Stroke 10W-30/SAE 30 Small Engine Oil Commercial-grade formulation for hot temperature, severe service operation of small engines where routine maintenance is often difficult or infrequent. Use wherever SAE 10W-30 or SAE 30 oil is specified in gasoline or diesel engines, transmissions, hydraulics and chaincases.

SKU: ASE Category:
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Commercial-grade formulation for hot temperature, severe service operation of small engines where routine maintenance is often difficult or infrequent. Use wherever SAE 10W-30 or SAE 30 oil is specified in gasoline or diesel engines, transmissions, hydraulics and chaincases.

“We’ve had many customers (using Generators) quote significantly longer run times per tank of fuel when they switched from another brand to the AMSOIL Small Engine Oil”

10W-30 Synthetic Small Engine Oil

Small Engine 10W-30 motor oil; SAE 30Using a high-quality small-engine oil has a direct effect on efficiency and profitability. Over time, wear and deposits rob small engines of power, reducing productivity. High heat can cause oils not formulated for severe service to boil off, leading to increased oil consumption, forcing the work crew to continually top-off the oil. AMSOIL Synthetic Small-Engine Oil is a tough formulation designed to preserve engine power while fighting oil consumption, helping professionals work more efficiently and save money on maintenance.

Product Data Bulletin

Fights Power Loss

Continuous severe-service operation accelerates wear and leads to harmful deposits that can stick rings and valves, robbing the engine of power. Power loss means less productivity and more maintenance. Synthetic Small-Engine Oil is a tough synthetic oil chemically engineered with anti-wear additives and heat-resistant anti-oxidants that protect pistons and bearings. After 500 hours of severe-service lab testing, AMSOIL 10W-30 Synthetic Small-Engine Oil virtually eliminated wear and deposits, helping preserve engine power and ensure productivity (see image).

Reduces Oil Consumption

Commercial-grade small engines run hot, with oil temperatures reaching 250ºF and higher. High heat causes standard-service oils to vaporize and exit the crankcase vent, leading to increased oil consumption. Heat also breaks down oil and forms deposits that lead to piston-ring sticking. Stuck rings fail to seal the combustion chamber and keep oil from entering and burning. As a result, workers must diligently check and top-off the oil to ensure the engine is protected, wasting time and money. AMSOIL Synthetic Small-Engine Oil’s heat-stable synthetic base oils withstand extreme heat better than other oils. In lab testing 10W-30 Synthetic Small-Engine Oil reduced oil consumption 61 percent compared to three leading 10W-30/SAE 30 motor oils**. It keeps engines clean for peak efficiency and reduced maintenance.

Long Service Life

On busy job sites, equipment maintenance can easily be delayed or overlooked completely. If using standard-service motor oils, high rates of oil consumption can leave the engine unprotected for extended periods, and it’s only a matter of time before catastrophic wear sets in. AMSOIL Synthetic Small-Engine Oil lasts longer than conventional oil, providing peace of mind that engines are protected, even when maintenance is delayed.

  • Preserves engine power
  • Helps cut maintenance costs
  • Fights heat and deposits

Applications and Recommendations

Use the appropriate viscosity of Synthetic Small-Engine Oil in applications that require any of the following specifications:

  • API SL, SJ, SH, SG…(Gasoline)
  • API CD, CF (Diesel)
  • JASO MA/MA2, (Wet Clutch)

Use 10W-30 Synthetic Small-Engine Oil in small engines found in (not limited to) mowers (zero-turn, riding, stand-on, push), generators, power washers and other equipment that requires SAE 30, 5W-30 or 10W-30 motor oil, including those made by Briggs & Stratton®, Honda®, Kubota®, Kawasaki®, Kohler®, Tecumseh®, Robin®, Onan®, Wisconsin®, Powertrain®, Yanmar®, Linamar® and Vanguard®.

Equipment types include maintenance equipment, tractors, lawn and garden equipment, compactors, pumps, light towers, log splitters, welders, cement mixers and trowels, skid-steers, excavators, rototillers and compressors.


AMSOIL Synthetic Small-Engine Oil is compatible with other conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil’s life expectancy and reduce the performance benefits.

Aftermarket oil additives are not recommended for use with AMSOIL motor oils.


AMSOIL Synthetic Small-Engine Oil is a long-life formulation that can last longer than conventional petroleum oils. It provides an extra measure of protection when equipment typically goes longer between oil changes than is recommended by the equipment manufacturer. Due to wide variances in operating conditions and maintenance practices, AMSOIL recommends extending drain intervals when monitored by oil analysis or following the equipment manufacturer-established drain intervals.


AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.


This product is not expected to cause health concerns when used for the intended applications and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available via the Internet at or upon request at (715) 392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

** Based on 125-hour lab tests of small engines using AMSOIL 10W-30 Commercial-Grade Synthetic Small engine Oil and three leading 10W-30/SAE 30 motor oils.

Buy in the Omaha store at 84th & G or use this Online link to the Amsoil sale page if you are outside of the area.

Customer Comments:

Formula 4 stroke engine oil
By Stephan 12/30/2016

from undisclosed

I have been using Amsoil for years and wouldn’t trust another. I use Amsoil in everything with great results, so I thought I would use the 4 stroke oil in all my small engines. Glad I did!!! No oil consumption, the engines run smoother and sound stronger. The 4 stroke oil even brought back an old decommissioned generator that was smoking to working condition. Amsoil does an amazing job again!

The 4-stroke oil is definitely superior
By Keith 12/26/2016

from undisclosed

I use this oil in my mowers, generator, and all of my small 4-stroke engines. I have been using it for about 2 years now and am amazed with the reduced oil consumption, and how clean looking the oil is after summer long intervals, unlike conventional oil that turns sooty black.

Exceptional Product!!!
By John 12/23/2016

from undisclosed

I have a Briggs and Stratton push mower and use only Formula 4 Stroke Small Engine Oil it. The old boy has never let me down and at 15 years old still fires up on the first pull. I change the oil only once a year and it does not burn oil and keeps on ticking. Thank you Amsoil for making such a superior product. I also use the Formula 4 Stroke Small Engine Oil in all of my small engines, to include snowblower, riding John Deere Mower and generator. After this product has proven itself time and time again I will use nothing else. This stuff is the BEST hands down.


Kinematic Viscosity @ 100°C, cSt (ASTM D445) 10.6
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 67.0
Viscosity Index (ASTM D2270) 146
Flash Point °C (°F) (ASTM D92) 236 (457)
Fire Point °C (°F) (ASTM D92)256 (493)
Pour Point °C (°F) (ASTM D97)-39 (-38)
Four-Ball Wear Test @ 40 kgf, 75ºC,
1200 rpm, 1 hr, scar diameter, mm (ASTM D4172)
NOACK Volatility, % weight loss (g/100g) (ASTM D5800) 4.1%
High Temperature/High Shear @ 150°C and 1.0 X 106s-1, cP (ASTM D4683), cP3.25
Total Base Number (ASTM D2896)8.4

Technical Service Bulletin

Subject: Viscosity of Mono grade and Multigrade Oils

Product Description: AMSOIL 10W-30/SAE 30 Motor Oil (ACD and ASE)

To explain how certain AMSOIL engine oils can qualify for both monograde and multigrade viscosity ratings. TECHNICAL DISCUSSION: Oil Classification System In selecting a proper engine oil, the vehicle owner must consider both the oil viscosity and the lubricant service requirements for the vehicle. To enable the owner to identify a proper oil, the vehicle manufacturers and the lubricant industry have developed a lubricant classification system (1).

When automobiles first appeared, attempts were made to identify motor oils. Viscosity was known to be one of the most important characteristics of an oil, and it was simply classified as light, medium or heavy, depending on its viscosity. When more advanced instruments were made avail- able to measure viscosity, the Society of Automotive Engineers (SAE) developed a better oil classification system.

This system, known as SAE J300 (1), was first related to the kinematic viscosity at 100 o C as shown in the following table I. This classification system was used for oil differentiation until the late 1960s. During this period of time, the lubricant oils were mostly prepared with mineral base stocks and had a very limited range of operation temperature. This led to the development of multi- grade engine oils which can be operated in a much wider temperature range.

Classification of Monograde Viscosity

Another way to classify the oil is to add the letter “W” behind the number. The “W” stands for winter and indicates that an oil is suitable for use in colder temperatures. The lower the number in front of the “W,” the better the cold temperature protection. This service classification mainly looks at the low temperature viscosity of the oil. For example, the following table lists the requirements of the low temperature cranking viscosity at different temperatures:

 Low Temperature Viscosity
SAE 20 and SAE 20W are two totally separate mono- grade classifications. SAE 20 describes the high temperature viscosity of the oil and SAE 20W describes the low temperature cranking capability of the oil.
In order to allow engines to start at low temperatures while providing sufficient viscosity at high temperatures to protect engines against wear, multi-grade oils were developed. An oil can be classified as a multi- grade SAE 20W-20 if the oil can meet both the low temperature cranking viscosity of 4500 cP at –15 o C and the 100 o C high temperature kinematic viscosity requirement between 5.6 and 9.3 cSt.
Typically, a type of additive called Viscosity Modifier (VM) or Viscosity Index Improver (VII) is added to the base oil to achieve multigrade performance. These types of organic polymer additives thicken the oil at high temperatures while having a minimal thickening effect at low temperatures. The addition of a viscosity modifier allows for the use of lower viscosity base oils to achieve the cold temperature requirements. The use of light weight petroleum oils in- creases oil volatility (burn- off), contributing to excessive oil consumption and oil thickening.
AMSOIL Heavy Duty Diesel Oil (ACD) and Small Engine Oil (ASE) meet multigrade viscosity require- ments without the use of visc osity modifiers. This is accomplished through the use of naturally high vis- cosity index, wax-free synthetic oils. These oils meet both the low temperature requirements of SAE 10W and the high temperature requirements of SAE 30. Thus the products are true SAE 10W-30 and SAE 30 oils.
AMSOIL ACD and ASE 10W-30/SAE 30 engine oils can be used in any applications requiring a monograde SAE 30 or multigrade SAE 10W-30 engine oil with the performance specifications listed for each product.
AMSOIL ACD has a performance emphasis on heavy duty on-road diesels with an API CI-4 Plus rating, while it is also applicable fo r gasoline engines with its API SL rating.
AMSOIL ASE has a performance emphasis on small gasoline and diesel engines used for commercial ser- vice or by the homeowner. AMSOIL ASE carries the API SL rating for gasoline and API CF/CD rating for off-road diesels.
1. Society of Automotive Engineers, Publication J- 300, December 1999.


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