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Motor Oil Test and Comparison

AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

AMSOIL Excels in API Sequence IIIF Performance Test

Motor Oil Performance Tests & Comparisons

Temperature Extremes Call For Superior Motor Oils

Why Harley-Davidson Owners Choose AMSOIL

Synthetic Motorcycle Oil & Harley-Davidson Warranty Issues

AMSOIL Synthetic Gear Lube Outperforms Valvoline Gear Lube

8.2% More MPG With AMSOIL Synthetic Lubricants

AMSOIL Proves Superior In Clark County Field Test

AMSOIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil is Correct Choice for Jeff Foster Trucking

AMSOIL Products Improve Efficiency and Reduce Operating Costs for Gerlach Trucking

What is the Noack Volatility Test?

What is the Four-Ball Wear Test?

What is TBN?


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Most Powersports Engine Problems Are Either Mechanical, Fuel-Related or Due to Neglect

AMSOIL offers products that can help avoid many of those problems.

Dan Peterson, Vice President, AMSOIL Technical Development

Len Groom
Technical Product Manager,

The last thing I want to deal with during my free time in the summer is engine problems. I want to be riding or getting my outdoor chores done, not diagnosing. But if a diagnosis is required, I'm quick to remember that most engine problems or failures that affect powersports equipment are either mechanical, fuel-related or due to neglect. Here are some of the most common problems that affect motorcycles, marine and handheld power equipment and strategies to prevent them.

Motorcycles: With motorcycles and motorcycle oils, heat is always an issue. In air-cooled bikes, motorcycle oil must provide adequate protection over a wide range of temperatures. In motorcycles with a shared oil sump, the oil must lubricate not only the engine, but the clutch and transmission, too. It must protect gears while providing sufficient grip to keep the clutch from slipping. What can happen if the oil fails to perform? Imagine it's the middle of summer and the engine overheats. The motorcycle will lose oil pressure and the engine will start to make enough noise to make most riders pull off the road and either push their bikes or call for help. A poorly lubricated transmission can result in gear wear, hard shifting and difficulty finding neutral. AMSOIL Synthetic Motorcycle Oil keeps gears lubricated, clutches working properly and provides heat protection when equipment is pushed to the limit.

Marine: Fuel-related issues are a major cause of problems in powersports applications, and particularly in marine equipment. These problems are specific to ethanol-blended fuels because ethanol has a strong attraction to water. If moisture is present in fuel, ethanol will detach from the gas and attach itself to the water. The ethanol/water mixture then drops to the bottom of the fuel tank - the same location from where the engine draws fuel. When the engine tries to run on this mixture, all kinds of problems can occur, including lean burn and corrosion in the fuel lines, carburetors and fuel tanks. The AMSOIL solution is easy: Treat every tank of gasoline with Quickshot® AQS) to ensure any moisture will be isolated and prevent the separation of gas and water.

Additionally, it's important to follow these guidelines when purchasing or storing fuel for use in powersports applications:

  • Use only fresh gas and buy fuel from outlets that have a high fuel turnover
  • Use fuel with an octane level equal to or above that recommended by the equipment manufacturer.
  • Don't store fuel for long periods of time, and only buy as much as you plan on using within the next 30 days. If fuel is stored longer than 30 days, be sure to add AMSOIL Gasoline Stabilizer (AST).
  • Fuels containing up to 10 percent ethanol are usually acceptable in powersports equipment.
  • Do not pre-mix any AMSOIL two-stroke oil with fuels containing more than 15 percent ethanol.

Handheld: Handheld equipment is largely powered by two-stroke engines. To pass emissions tests, this equipment is often designed to run on a lean air/fuel mixture, which doesn't leave much room for variances in fuel. And because this equipment is air-cooled, high temperatures can wreak havoc on the engine and lead to mechanical failure. When this happens, the engine oil is often blamed. AMSOIL SABER® Professional (ATP) is formulated specifically for high-heat, high-rpm, lean-burn, air-cooled power equipment. It is purpose-built to keep your equipment on the job, working until finished.

Beyond mechanical and fuel-related issues, other common causes for failure in powersports applications include the following:

  • Ingestion of abrasive materials, such as dirt and dust
  • Rust and corrosion caused by improper storage
  • Abuse or lack of proper maintenance
  • Reaching the end of equipment life expectancy

Although it is possible to experience an oil-related problem, the likelihood that the difficulty relates to a deficiency with an AMSOIL product is extremely remote. As we've discussed, mechanical problems and failures do occur in powersports equipment. If the problem is oil-related, the following reasons are most common:

  • The wrong fluid was used.
  • Either too much or too little fluid was used.
  • The lubricant was contaminated with dirt or water.

By simply using the right product in the right place in the right amount at the right time, many powersports engine problems can be avoided, and you can spend more time riding the roads, waters and trails and getting those weekend chores done, backed by the proven protection of AMSOIL products. Published, AMSOIL Magazine 05/14.

AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oils are formulated to meet the latest API SN Resource Conserving and ILSAC GF-5 industry specifications. AMSOIL Signature Series Oils include 0W-20, 0W-30, 5W-30 and 10W-30 and represent the very best motor oils AMSOIL has to offer, allowing motorists to take advantage of maximum extended drain intervals. AMSOIL Signature Series Synthetic Motor Oils are recommended for drain intervals of up to 25,000 miles/one year, whichever comes first (15,000 miles/one year in severe service conditions).

Click here for more information

Premium AMSOIL Synthetic Motor Oils offer the longest drain intervals on the market, unsurpassed protection and performance that effectively extends equipment life and improved fuel economy, saving customers money at the pump and reducing the nation's dependence on foreign oil.



Motorcycle Testimonials

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AMSOIL Synthetic Diesel Oil Articles and Testimonials

"AMSOIL INC. warrants that the use of its lubricants will not cause mechanical damage to any mechanically sound equipment when AMSOIL INC. products are used in full compliance with the company's recommendations and instructions."


AMSOIL synthetic motor oils are formulated to surpass engine test specifications, offering protection far greater than competing motor oils for extended drain intervals. Most synthetic oil manufacturers make no claim to extended drain intervals, deferring to the maintenance schedule provided by the vehicle manufacturer. With its unparalleled oil and warranty program, AMSOIL offers consumers unprecedented protection and economics.

Another AMSOIL First

More than 20 years ago, AMSOIL began using the NOACK volatility test as a comparison tool and measurement of quality. Back then, nearly every oil tested side-by-side with AMSOIL synthetic motor oils failed, and those that passed barely squeaked by. Other oil companies paid no attention to NOACK results until Ford Motor Company made it a requirement for service fill oils, validating what AMSOIL had said all along.

THE NOACK Volatility Test
The NOACK Volatility Test determines the evaporation loss of lubricants in high temperature service. The more motor oils vaporize, the thicker and heavier they become, contributing to poor circulation, reduced fuel economy and increased oil consumption, wear and emissions. AMSOIL Synthetic Motor Oil resists high temperature volatization better than other motor oils. AMSOIL Synthetic Motor Oil maintains peak fuel efficiency and reduces oil consumption and emissions.

AMSOIL Now An ISO Certified Manufacturer
AMSOIL recently received ISO 9001:2000 certification of our Quality Management System (QMS). NSF International Strategic Registrations is the registrar that has verified our QMS meets the requirements of the ISO 9001:2000 standard, the most widely utilized quality standard throughout the world for quality management systems. ISO standards are used by over 300,000 companies worldwide setting rigorous standards for businesses, government and industry.

ISO 9001:2000 is applicable to any manufacturing and service organization providing a framework for system development that focuses on the customer, quality system performance and ongoing improvement. AMSOIL received ISO 9001:2000 registration under the scope: synthetic lubricants blending, packaging, and other fulfillment directly associated with lubricant product.

The ISO certification puts AMSOIL in line with some of the most efficient companies in the world. It is further assurance that the products and services AMSOIL provides will continue to maintain the high level of quality the company always demanded.

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