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AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

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Why Harley-Davidson Owners Choose AMSOIL

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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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High Quality Oil Is Necessary To Keep Cold Weather Hydraulic Applications Operational

Viscosity grade is not the only indicator of performance.


Mike Caruso
Technicle Product Manager, Drivetrain

Most of us have watched one of the popular reality-TV shows involving fishing, mining, logging or trucking. Without fail, there seems to be some dramatic mechanical failure that keeps us in suspense during the commercial break. Failures involving hydraulic systems often happen in cold temperatures. Many of us can sympathize with the guy on the show; he's shown lying under the equipment with no gloves on his hands, snow is falling and his jacket is covered in oil. The drama provides great entertainment, but also a great example of the significant time and money lost every year in hydraulic equipment operated in cold temperatures.

So why do these guys always end up facing hydraulic equipment failures in the middle of the winter? Most often it is due to poor maintenance, poor startup procedures and continued use of a cheap hydraulic fluid that gets too thick in cold temperatures.

Completing scheduled hydraulic system maintenance throughout the year can significantly reduce cold-temperature downtime. Unfortunately, tight schedules, remote job sites and the need to keep equipment running at all costs can mean that badly worn hoses, leaky seals and other maintenance items go unchanged for extended periods. The colder the ambient temperature gets the more likely a catastrophic failure of one of these weak points will occur, and poor-quality hydraulic oil may accelerate the failure.

Hydraulic oil must protect moving parts from excessive wear, keep the system clean and free from varnish and transmit energy to complete a number of different jobs such as moving mountains of dirt and cutting trees off at their bases. To do these jobs, it's critical that the hydraulic oil stay within range for thickness regardless of the outside temperature. This is especially important during cold-temperature starts, when damage and accelerated wear can occur quickly if the oil gets too thick.

Damage and wear can be caused by starving the inlet side of the hydraulic pump (pump cavitation). This can occur during cold weather when oil becomes so thick that the pump is unable to pull fluid from the reservoir fast enough for continuous lubrication supply. Instead, the pump pulls air, components become starved of lubricant and metal-to-metal contact occurs. Overly thick oil also contributes to pressure spikes that blow hoses, filters and other critical components. To help prevent this condition, most equipment manufacturers include hydraulic oil viscosity recommendations in their operator manuals and will often recommend thinner oil for cold ambient temperatures. This is one way to help solve the problem, but we all know that synthetic lubricants provide a solution through higher viscosity index. High-viscosity-index synthetic hydraulic fluids remain much more fluid in cold temperatures while maintaining a protective layer of fluid in high temperatures. The higher the VI, the less the fluid's viscosity will change due to temperature fluctuations.

The importance of this can be illustrated by comparing a cheap mineral oil with a high-VI synthetic hydraulic oil. Both oils have the same thickness of 32 cSt at 40°C (ISO 32). But, the synthetic hydraulic oil has a VI of 160 and the mineral-oil-based hydraulic fluid has a VI of 90. When both oils are cooled to 10°F, the low-VI mineral oil thickens much more than the high-VI synthetic oil. Even though the oils are classified as having the same ISO viscosity, the high-VI synthetic oil will flow much better at 10°F. This means better lubrication for the pump and less chance of a pressure spike, damaging cavitation or blowing neglected weak points in the system. Bottom line: Fluids with a higher viscosity index provide better protection in cold temperatures than fluids with a lower viscosity index.

On the other end of the spectrum, hydraulic oils need to fight varnish and sludge buildup most often associated with high-temperature, high-pressure industrial environments. Not all hydraulic oils are designed to provide effective resistance to varnish and sludge in these environments, and varnish and sludge are directly responsible for sticking valves and other operational issues. As temperatures increase, hydraulic oils thin out. In excessive temperatures, some do not provide the required oil thickness to adequately protect against wear. Additionally, oils not formulated correctly for these extreme applications allow varnish to form after continual operation at high temperatures, and sensitive operationally controlled valves begin to malfunction.

Just like motor oils, not all hydraulic oils are created equal, and that is especially evident in cold-temperature applications. AMSOIL synthetic hydraulic oils can greatly reduce cold-weather problems. They also provide outstanding oxidation resistance for longer fluid life and significantly better resistance to harmful varnish that plagues many hydraulic systems operating in hot industrial environments. AMSOIL has the hydraulic products to keep customers running smoothly in both extreme cold and in hot industrial environments. Published, AMSOIL Magazine 12/12.

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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