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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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Diesel Fuel Quality Can Vary Greatly From One Location To The Next

With Fewer Details Posted On The Pump, Diesel Drivers Have Little Indication Of The Fuel's Quality Or Performance.

Dan Peterson, Vice President, AMSOIL Technical Development

Mark Nyholm
Technical Product Manager,
Heavy Duty

I can't tell you how many times I have stood at the #2 ultra-low-sulfur diesel (ULSD) pump and wondered just what I am getting out of that green-handled spout. This concern is heightened during seasonal changes from warm to cold when all diesel drivers begin worrying about fuel gelling. The regulations controlling what is posted at the pump are very different for gasoline and diesel fuel. When you pull up to a gasoline pump you at least know what octane fuel you are buying. Diesel fuel is different, but rest a little easier knowing there are federal regulations controlling certain performance properties of the fuel - they just don't have to post most of them at the pump.

Diesel fuel is a refined product of crude oil. If you performed a diesel fuel study and compared fuels across the country, you would find substantial differences in performance; however, you would also find that all fuel refineries meet a federally regulated standard for a few key fuel properties. The first is sulfur content. The maximum limit on sulfur content in on-road diesel fuel was reduced in 2007 from 500 ppm to 15 ppm, in accordance with the Environmental Protection Agency's Clean Air Highway Diesel rule mandating a 97 percent reduction in the sulfur content of highway diesel fuel. The new ultra-low-sulfur diesel allowed engines to be fitted with exhaust systems that emit less particulate matter and nitrogen oxide. Unfortunately, reduced sulfur in fuel results in increased wear in fuel systems and injectors. Sulfur in fuel acts as a natural anti-wear agent that protects fuel pumps and injectors from premature failure, so the reduced sulfur content left a hole that needed to be filled by lubricity additives.

Another regulation requires diesel fuel to have a certain level of lubricity out of the pump as measured by the high-frequency reciprocating rig (HFRR), a widely used friction and wear-scar testing system. For the HFRR test, the lower the number recorded (in microns), the more protection provided by the fuel. The maximum wear scar permitted in the U.S. is 520 microns. With sulfur all but gone from today's diesel fuel, refineries have started adding lubricity additives to ULSD to make up for lost wear protection.

The second key property is cetane index. This is a measurement of diesel fuel's combustion efficiency during ignition. The higher the number, the more easily and completely the fuel combusts. In the United States the minimum cetane value is 40. Fuel with a cetane number greater than 52 rarely delivers a substantial performance benefit in engines designed in the U.S. Because cetane values vary from region to region and cetane numbers aren't posted at the pumps, diesel operators have no indication which stations offer higher cetane diesel. If you get your hands on test data, optimum engine performance is found with cetane values between 46 and 50.

Depending on your winter driving conditions, the most important diesel fuel property may be its cold flow or its resistance to gelling in cold temperatures. The cold filter plugging point (CFPP) is used to determine the lowest temperature at which fuel will flow without plugging the fuel filter. Refineries accommodate seasonal changes by making a winter blend in which they mix the normal #2 ULSD with a percentage of #1 diesel (kerosene) and some cold-flow additives. Refineries increase the percentage of #1 diesel and cold-flow additives depending on region and temperature throughout the winter months to combat potential fuel-related cold-weather driving problems. There are no federally mandated minimum CFPP values that refineries must target for cold temperatures; and, unfortunately, fuel stations again do not have to post the cold-weather performance of the fuel at the pump.

AMSOIL has long recognized this variation in diesel fuel properties and offers several products that provide additional performance and security for diesel engines. AMSOIL Diesel Concentrate (ADF) provides both detergency to clean fuel injectors and the combustion chamber, and a lubricity additive to help lubricate the fuel pump and injectors to compensate for the lack of lubricity in ULSD. AMSOIL Cetane Boost (ACB) increases the cetane index for improved ignition performance and power. AMSOIL Cold Flow Improver (ACF) helps reduce the cold filter plugging point and protects engines from fuel starvation in cold winter conditions. In times of extreme cold, or when the fuel you purchased won't flow in cold conditions, AMSOIL Diesel Recovery Emergency Fuel Treatment (DRC) quickly dissolves gelled fuel and thaws frozen fuel lines and filters.

You can't guarantee high-quality fuel at the pump, but you can guarantee AMSOIL diesel fuel additives will make that fuel the best it can be to keep your diesel-powered application running at peak performance throughout the year. Published, AMSOIL Magazine 10/12.

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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