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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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Chemical Reactions Occur In Motor Oil, Even When Not In Use

A High-Quality Lubricant Is Engineered To Withstand The Effects Of These Reactions Longer, But There Are Limits.

Dan Peterson, Vice President, AMSOIL Technical Development

Dan Peterson
Vice President,
Technical Development

Many people already know that severity of service puts additional stress on engine oil, but we don't talk much about the effects Father Time has on oil. Chemical and physical changes are occurring in your engine oil from the day it is installed in your vehicle, even when the vehicle is not in use. Just like inside your body, there are a number of different reactions occurring inside your engine that impact its overall health. Like eating too many Big Macs and drinking too much Coca-Cola can accelerate reactions that can harm your health, contaminants introduced into your motor oil can accelerate reactions that can harm your engine.

AMSOIL Signature Series Synthetic Motor Oil is recommended for 25,000 miles in normal service. I've driven only 18,000 miles since last spring when I changed my oil, so why do I need to change it after a year in service? The oil level is full, so why not just keep driving and get the full 25,000 miles out of the oil? It may be possible through oil analysis, but without verifying a clean bill of health, the oil must be changed to ensure the vehicle is protected.

Motor oil is continually subjected to a variety of forces and contaminants that degrade the oil's quality until, ultimately, fresh oil is required. Forces such as oil-pump shear and contaminants such as combustion by-products, fuel, water and coolant all affect the expected life of motor oil.

Combustion by-products pass by the rings, seep into the oil sump and reduce motor oil life. Higher concentrations of by-products in the oil affect the rate at which chemical reactions occur, but the amount of time combustion by-products are in contact with motor oil also has an effect. The acids and free-radicals created when burning gasoline or diesel fuel accelerate chemical reactions that degrade motor oil. When you install brand new oil and start the vehicle, these reactions begin and continue, to an extent, even when the vehicle is not operating. These chemical reactions result in increased viscosity, oxidation and nitration levels in the motor oil.

Fuel dilution is another major cause of motor oil degradation. Vehicles driven for short trips that do not reach normal operating temperatures don't get hot enough to evaporate fuel from the sump. Gasoline trapped in the oil sump thins the oil and promotes chemical reactions that degrade the oil. This phenomenon is more pronounced in diesel applications because diesel is less volatile and does not readily evaporate, reducing engine oil viscosity as fuel builds up in the oil sump.

Water and glycol contamination tend to occur together, but water without glycol is also common. Glycol, a common component of antifreeze, is a particularly damaging contaminant and is estimated to account for 60 percent of all engine failures. Antifreeze can enter the engine through a leaky head gasket, faulty oil cooler or other area. It doesn't take much glycol to degrade motor oil, reduce lubricity and react to thicken the oil to the point where the oil pump cannot supply enough oil to the engine for proper lubrication. Once that happens, the engine comes to a screeching stop.

Water is usually the primary source of trouble for oil in a vehicle that is only driven occasionally, such as an RV or a classic car. In those cases, water from condensation can build up in the crankcase and remain there for long periods if the engine is not brought up to operating temperatures on a regular basis. Once an engine is warmed up, the water evaporates and is removed from the engine by the crankcase ventilation system. If not, the water will degrade the oil and potentially promote corrosion within the engine.

Other forms of contamination that affect oil life include questionable oil additive products, excessive soot from a poorly running diesel and residue left by pressurized injector cleaning. These contaminants all affect engine oil life over time. As vehicles age, the chance of encountering some or all of these contaminants increases. Since these reactions start with the turn of a key and continue even when the engine is not running, there has to be a time limit placed on lubricant life for good vehicle protection. Without a qualified used oil analysis program in place, a conservative limit is used to ensure the oil is changed prior to becoming critical; hence the one-year limit on AMSOIL Signature Series Motor Oil. Keeping your vehicle working optimally through good preventative maintenance also helps to keep contamination to a minimum, but it does not eliminate it altogether.

The bottom line is that after being used for one year, there are just too many possible chemical reactions to guarantee protection without used oil analysis for verification. If you are using an AMSOIL product, you have proven that you care about your equipment. Making wise choices and following proven techniques is the next step in becoming a lubrication expert. If it is true that information is power, then everyone should be able to explain how contamination affects engine oil life over time - on a quest to reach AMSOIL superhero status! Published, AMSOIL Magazine 05/12.

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).

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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.



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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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