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AMSOIL vs. Mobil 1

409,000-Miles Without An Oil Change

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8.2% More MPG With AMSOIL Synthetic Lubricants

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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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CVT and eCVT Transmission Technology Differ Greatly

The basic mechanisms of each are completely dissimilar.


Mike Caruso
Technicle Product Manager, Drivetrain

You may have noticed that AMSOIL Fuel Efficient Synthetic (ATL) and Multi-Vehicle Synthetic ATF (ATF) are now recommended for electronically controlled continuously variable transmissions (eCVTs) in certain vehicles. eCVTs, such as those found on the Toyota Prius, are significantly different from belt- and chain-driven continuously variable transmissions (CVTs). Several automakers use CVT technology, so it's important to understand the differences between belt-and chain-driven CVTs and eCVTs, which are closer to traditional step-type automatic transmissions in design.

The primary purpose of any transmission, regardless of type, is to transfer power from the engine through the drivetrain and, finally, to the wheels. To do so, it must work within a narrow engine rpm band to ensure it produces enough torque for the immediate needs of the vehicle and then transmit that torque to the driveline. Getting a heavy vehicle moving from a dead stop requires a lot of torque. Step-type automatic transmissions use a set of gears called planetary gears that work together in different combinations called gear ratios. These gear ratios make it possible to get a vehicle moving from a dead stop and continue a smooth pattern of acceleration all the way up to cruising speed. Each "step" is simply the transmission changing from one gear ratio - or one speed - to the next.

Traditional automatic transmissions select a low gear ratio to get the vehicle moving from a dead stop. As the vehicle builds momentum, less torque is required to keep it moving and the transmission shifts to higher gear ratios in sequence, slowing the engine at each step until the vehicle is at cruise. Traditional automatic transmissions have been in use in the U.S. for over half a century. The efficiency of this technology has been enhanced over the years, but there is always room for improvement.

With ever-rising fuel economy standards, auto manufacturers spend a lot of time looking at ways to use the transmission to improve the engine's efficiency. Each engine design produces its most efficient power at a predetermined rpm - the "sweet spot." One key to better fuel efficiency is keeping the engine in its sweet spot for as long as possible.

When you drive a conventional step-type automatic transmission, you feel the rpm rise and drop each time the transmission shifts to the next gear ratio. Each one of these bumps is an inefficiency that consumes extra fuel because the engine is taken out of its sweet spot. The same is true when you're climbing a grade and the transmission drops into a lower gear, making the engine run faster and use more fuel. One way manufacturers address this issue is by adding more gear ratios. This has the benefit of shortening the duration of the bumps and gives the transmission more options to keep the engine at its optimum rpm. The inefficiencies can't be completely eliminated, however, because the transmission is physically limited by a finite number of gear ratios.

CVTs take a different approach to managing rpm. Instead of gears, the most common CVTs in the U.S. use a metal belt or chain running between two pulleys. These pulleys are designed to spread open or squeeze closed under hydraulic pressure, forcing the belt or chain to ride higher or lower in them. The advantage of this system is the vehicle's computer can quickly and continuously adjust the pulleys to whatever ratio is required for peak efficiency because it isn't physically limited by gears. When driving a CVT-equipped vehicle the driver pushes on the gas pedal and the CVT adjusts to keep the engine at its most efficient rpm through the entire acceleration process. There are no bumps or rpm increases felt by the driver. This is even true when climbing a grade. The engine stays at its most efficient rpm and the CVT adjusts to allow the car to get over the hill.

The eCVT found on the Toyota Prius and other hybrids differs from CVTs found in other vehicles, such as the 2013 Nissan Altima or 2012 Scion iQ, because it does not use a belt or chain connected to a pair of variable pulleys. Instead, an eCVT uses electric motor/ generators to control the speeds of planetary gearset components. This allows the eCVT to continuously change the gear ratio, keeping the engine's rpm in the sweet spot. Just like when driving other CVT-equipped vehicles, drivers of vehicles with eCVTs don't feel the step change common to traditional automatic transmissions, yet the mechanisms (planetary gears) to achieve acceleration are largely the same.

Recent test data has shown we can confidently recommend AMSOIL Fuel Efficient Synthetic Automatic Transmission Fluid and AMSOIL Multi-Vehicle Synthetic Automatic Transmission Fluid for eCVTs, and they will deliver the same high performance in eCVTs as they do in traditional automatic transmissions. Published, AMSOIL Magazine 09/12.

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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