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Motor Oil Test and Comparison

AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

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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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Variable Valve Timing Presents Yet Another Complexity For Motor Oils to Overcome

Now More Than Ever, Quality Motor Oil is Key to Engine Longevity.

Dan Peterson, Vice President, AMSOIL Technical Development

Matt Erickson
Technical Product Manager,
Passenger Car

Driven by higher fuel-economy requirements and increasingly stringent emissions limits, vehicle manufacturers are adding new technology to engines and making advancements to existing systems. The system used to vary the timing of intake and exhaust valves opening and closing is one area receiving lots of attention.

Like people, engines must also "breathe." To combust one gallon of gasoline, an average engine requires approximately 10,000 gallons of air. Getting the most from the fuel-air mixture is vital for top engine performance. This requires precise regulation of valvetrain components, including the camshaft and valves. Valves are opened and closed to control the delivery of fresh air and fuel to the cylinder and to evacuate exhaust gases from the cylinder after burning fuel. The action of the valves is controlled by the camshaft. Valves are pushed open by cams (lobes) and closed by springs. Valve timing is controlled by the shape of the cam lobe and position of the camshaft relative to the crankshaft. In traditional engine designs, the timing of each valve is locked and cannot be changed without physically changing the camshaft. As a result, some engines have camshaft designs that create great low-engine-rpm performance, or others, like old street rods or dragsters, that have very good high-rpm performance. The challenge is creating a system that performs efficiently at both low engine rpm and high engine rpm. Enter variable valve timing systems.

Variable valve timing (VVT) is a decades-old technology that was introduced to overcome the inherent limitations of fixed valvetrain systems. Its use has steadily grown since the late-1990s, and VVT can now be found in nearly all 2011 and later vehicles. VVT permits the opening and closing action of the valves to occur sooner, or be delayed, relative to the position of the piston. This makes it possible to achieve optimal fuel economy and performance at low speeds and when passing someone on the highway. It also results in lower emissions.

There are several VVT systems used by OEMs, and there have been recent advancements in the control of these systems. Many systems use oil-pressure-operated mechanical devices to change valve timing (when the valve opens and closes), valve duration (how long the valve is open) and valve lift (how far the valve opens). For example, the Honda i-VTEC system uses oil pressure to lock the motion of intake valves together via pins and transfers their motion to a different cam profile to adjust for the boost in performance required above 4500 rpm. At low engine speeds, the intake valves are opened slightly to reduce fuel consumption while providing enough torque for acceleration; at high engine speeds the intake valves are opened wide for increased power.

Other systems, such as Toyota's VVT-i, vary the valve motion by adjusting the timing of the camshaft in relation to engine speed. Oil-pressure-actuated devices, commonly called cam phasers, are used to control that motion. Cam phasers allow the valves to open or close earlier or later in relation to the position of the piston. When the intake and exhaust valves are operated by separate camshafts, the timing of those valves can then be changed independently. This makes it possible to increase the time that the intake and exhaust valves are open simultaneously - also known as valve overlap - which is used to help control emissions. Controlling valve overlap allows engines to implement internal exhaust gas recirculation (EGR), which has improved performance over the alternative external-valve EGR technology.

VVT systems are complex arrangements involving many intricate components, and they often involve oil-actuated hydraulic devices to control valve motion. They are generally non-serviceable, and many common problems associated with VVT systems are linked to poor oil or filter performance. Sludge or deposits can plug the solenoid screen or oil galleries and impact the operation of VVT mechanisms. This not only disrupts performance, it can be the first step toward a costly repair bill.

With vehicle manufacturers wringing every bit of efficiency out of systems to meet fuel-economy requirements, using high-quality motor oil of the proper viscosity is extremely important. The consistent flow of clean oil is vital for VVT systems' operation. This means motor oil must have excellent cold-temperature properties to move quickly through the small oil galleries upon startup. It must also have the proper balance of detergents and dispersants to prevent deposits, sludge and varnish that clog hydraulic pathways critical to proper engine operation. AMSOIL synthetic motor oils are engineered for the performance demands of VVT technology and promote component longevity to ensure that the systems function properly. Published, AMSOIL Magazine 05/13.

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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