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Improved Fuel Economy

Jim Ackney

There are many reasons to use Amsoil 100% Synthetic Oils and Lubricants in your vehicles and equipment. Not the least of which is Improved Fuel Economy.

The use of AMSOIL synthetic lubricants and fuel additives help customers stretch their fuel dollars.

AMSOIL synthetic motor oils, gear lubes, transmission fluids, air filters and fuel additives can have a profound impact on fuel economy.

With gasoline and diesel prices continually climbing and setting record highs, improved fuel economy has become a top priority for people and businesses that rely on vehicles and heavy equipment in their daily operations. In addition to providing superior protection and performance, AMSOIL synthetic motor oils, gear lubes, transmission fluids, air filters and fuel additives can have a profound impact on fuel economy.

Synthetic Lubricants

AMSOIL synthetic motor oils, gear lubes and transmission fluids effectively improve fuel efficiency through reduced friction (fluid friction and friction between moving parts), superior thermal and oxidative stability and resistance to volatility.

Fluid Friction

Refined petroleum-based lubricants are composed of irregular molecules of various sizes. As they slip across each other, excess friction is created. The vehicle's engine must bum extra fuel to overcome this friction, decreasing fuel economy. AMSOIL synthetic lubricants, on the other hand, contain only smooth, uniform molecules that easily slip across each other, reducing internal friction within the lubricant, allowing fuel to be diverted from the task of overcoming friction to reaching the drivetrain, decreasing overall fuel consumption.

In addition, AMSOIL offers lower cold temperature viscosity synthetic motor oils that further reduce fluid friction and increase fuel economy in below-normal operating temperatures without sacrificing protection and performance. Synthetic 5W-40 Premium API CJA Diesel Oil (DEO), for example, is recommended for diesel applications requiring heavier cold temperature viscosity 15W-4O diesel oils, while Synthetic OW-20 Synthetic Motor Oil (ASM) is recommended for gasoline applications requiring 5W-20 motor oils, and Signature Series OW-30 Synthetic Motor Oil (SSO) is recommended for gasoline applications requiring 5W-30 and 10W-30 motor oils.

Friction Between Moving Parts

Oil viscosity plays a critical role in reducing friction. If viscosity is too high, it contributes to fluid friction, while an oil with a viscosity that is too low cannot adequately maintain a complete, unbroken oil film between engine surfaces. Without this film, excess friction is created between moving parts, increasing wear and fuel consumption.The synthetic construction of AMSOIL synthetic lubricants ensures viscosity remains consistent due to excellent high temperature/high shear properties, main¬taining an unbroken oil film between engine parts, reducing friction and decreasing fuel consumption.

Thermal and Oxidative Stability

Some of the chemicals in conventional lubricants break down at temperatures within the normal operating range of many vehicle and equipment components, coating components with varnish, deposits and sludge and leaving the oil thick and difficult to pump. This higher viscosity oil reduces engine and fuel efficiency because components must expend extra energy, and extra fuel, to do their jobs. AMSOIL synthetic lubricants contain no volatile contaminants, making them much more resistant to thermal and oxidative breakdown. Components stay clean, oil viscosity remains constant and fuel efficiency remains high.


Conventional lubricants are also very susceptible to volatility. When the oil's lighter molecules volatilize during hot operating conditions, it contributes to further viscosity increase and reductions in fuel economy. Because AMSOIL synthetic lubricants contain uniformly sized molecules, they resist volatilization much better than conventional lubricants, maintain their viscosities and allow more fuel to be used for vehicle propulsion, improving fuel economy.

Industry tests demonstrate an average conservative two to five percent increase in fuel economy by switching to synthetic lubricants, while many AMSOIL customers report even larger gains. According to the most recent data from the Bureau of Transportation Statistics, the average passenger vehicle uses 554 gallons of gasoline per year. At a price of $4 a gallon, 554 gallons of gas costs $2,216. A five percent fuel economy improvement would save 27.7 gallons of gasoline and yield $11 0.80 a year in fuel savings. That's enough to cover the price of a year's supply of AMSOIL synthetic motor oil and Ea Oil Filters, with money left over.

Fuel Savings Example:

Imagine a fleet of 100 class 8 diesel trucks running an average193,000 kilometers per year at an average 10.4 kpg with diesel fuel at $4.70 a gallon. Using those numbers, the fleet spends $8,676,923.08 on fuel annually. A five percent fuel economy improvement would increase the fleet's fuel efficiency to 10.9 kpg and reduce fuel costs to $8,263,736.26. That's a savings of $413,186.82, enough for 87,912 gallons of fuel.

More Fuel Savings

In addition to the fuel savings provided by AMSOIL synthetic lubricants, fuel additives contribute to further fuel efficiency.

Fuel Additives 

P.I. Performance Improver (API)

As a vehicle's engine accumulates miles, its performance suffers from gasoline fuel-generated deposits that form on the fuel injectors, intake valves and combustion chamber. One of the negative effects caused by these deposits is decreased fuel efficiency. AMSOIL PI. Performance Improver is the most potent gasoline additive available today. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber, intake valve and fuel injector deposits, restoring peak engine efficiency, fuel economy, power and drivability; Tests show PI improves vehicle fuel efficiency by an average of 2.3 percent and up to 5.7 percent.

Diesel Concentrate (ADF)

Like gasoline engines, diesel engines also become less efficient over time. Fuel injector deposits interrupt spray patters causing poor fuel atomization, incomplete combustion, excessive emissions and smoke. Tests prove that AMSOIL Diesel Concentrate cleans dirty injectors, improving fuel economy by up to five per¬cent and restoring horsepower to like new.

Cetane Boost (ACB)

By raising cetane up to seven points, AMSOIL Cetane Boost effectively improves combustion efficiency for increased power and performance in all diesel engines, increasing fuel efficiency up to 2 percent.

Browse the full line of premium AMSOIL products in the latest AMSOIL factory direct catalog.

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