AMSOIL first in synthetics
Tracey Dean
Austin & Kyle, TX
CALL (800) 890-0220


AMSOIL provides fuel additives that work for a large number of applications: storage, performance enhancement, increased fuel economy, extended engine life, maximum horsepower, cold weather operation, and more. Fuel additives are available for both gasoline and diesel motors. 

Do Fuel Additives Work?

Most people will search this in Google and after reading a couple of the links determine that fuel additives do not work. However, most motorists expect to experience the benefits promised by fuel additives immediately, when it takes several tanks of treated fuel before most additives provide any noticeable performance improvement. That doesn’t bode well in a society used to getting what it wants, when it wants it.

It takes a fuel additive formulated to the correct concentration to deliver immediate results. And the fact is, most additives on the market simply don’t contain a sufficient concentration of cleaning agents to provide immediate results.

That’s where AMSOIL is different. P.i. Performance Improver, for example, is one of the most potent gasoline additives on the market today. It does an excellent job cleaning deposits to improve fuel economy up to 5.7% and an average of 2.3%. It also reduces emissions. Simply take a look at the before/after images shown here and you can see the dramatic results after just one tank of fuel treated with P.i.

AMSOIL P.i.: A Case Study

In response to Environmental Protection Agency (EPA) fuel economy and emissions regulations, fuel injectionsystems replaced carburetors in new vehicles in the 1980s. Fuel injectors allow more precise control of fuelthan carburetors, improving fuel efficiency and minimizing emissions. However, in order to work efficiently,they must be kept clean. Because performance suffers as fuel injectors become dirty, the U.S. governmentmandated in the mid-1990s that all gasoline sold in the U.S. be formulated with a lowest additive concentration(LAC) level of detergent additives to help keep engines clean and emissions under control. However, ittakes a very low level of additive to pass the tests, and most gasoline on the market contains as little as 123parts per million (ppm) of additive.

The low levels of detergent additives in modern gasoline allow deposits to build up on critical fuel systemcomponents, and most motorists are unaware of how dirty the insides of their engines are. AMSOIL P.i. PerformanceImprover is an effective one-tank, total fuel system cleaner. More potent than other fuel additiveson the market, P.i. effectively cleans everything the fuel touches, including both port and direct fuel injectors,intake valves and combustion chambers, in only one single tank of gasoline, removing the deposits thathave built up over thousands of miles. Removing engine deposits with P.i. effectively improves fuel economy,reduces emissions, restores power, performance and acceleration, reduces octane requirements, increasesengine life and reduces maintenance costs.

  • AMSOIL P.i. provided the following clean-up benefits after only one tank of gasoline:
  • Improves fuel mileage an average of 2.3% and up to 5.7%
  • Reduced emissions
  • Restored power and performance
  • Reduced need for costly higher octane fuel
  • Reduced noise from carbon rap and pre-ignition
  • Better drivability
  • Smoother operation

Recommended Use

Treat one full tank of gas up to 20 gallons with one bottle or up to 40 gallons with two bottles. Using more than two bottles pertreatment is not recommended. Large gas tanks should only be partially filled to 40 gallons to maintain the proper concentrationratio of one bottle per every 20 gallons for best results. Treat every 4,000 miles (or 100 hours for marine, stationary and off-roadgasoline-powered engines). P.i. helps pass emission tests (treat one full tank of gas, run that tank and fill up again prior to test).Safe for use with catalytic converters, oxygen sensors, oxygenated gas and 10% ethanol blended gas. Not recommended fortwo-cycle engines.

AMSOIL Gasoline Fuel Additives

How are AMSOIL fuel additives different?

To understand why additive performance varies, you should understand why your engine may need a fuel additive in the first place. For optimum fuel efficiency and lower emissions, fuel must first be atomized into a fine mist prior to combustion. Over time, injector deposits produce irregular spray patterns with heavy streams of gasoline that reduce performance (see injector “before” image), while intake valve deposits also decrease efficiency. Today’s injectors are highly engineered to tight tolerances, and even minute deposits interfere with the spray pattern and reduce power and fuel economy. The problem is especially pronounced in newer high-pressure common-rail (HPCR) diesel engines and in direct-injection engines that locate the injectors in the combustion chamber, exposed to intense heat.  

AMSOIL fuel additives, however, are different. As performance concentrates, they boast potent formulas designed to provide nearly immediate results. AMSOIL P.i. Performance Improver, for example, does an excellent job cleaning deposits to improve fuel economy up to 5.7% and an average of 2.3%. The before/after images show the results after just one tank of fuel treated with P.i.

AMSOIL applies the same philosophy to all AMSOIL fuel additives. For example, AMSOIL Diesel Injector Clean provides the lubricity needed to protect the fuel pump and injectors while cleaning deposits for peak performance. AMSOIL Quickshot, meanwhile, cleans powersports fuel systems and fights ethanol problems to help you get the most out of your motorcycle, snowmobile, lawn mower and other equipment.

AMSOIL Diesel Fuel Additives

Steps for Effective Equipment Storage

Preparing motorcycles, snowmobiles, lawn mowers and other equipment for storage is important even where seasonal changes aren’t pronounced. Gasoline can break down in as little as 30 days, causing performance issues, while rust and corrosion can form on internal engine parts. Proper storage procedures should be followed any time equipment sits for extended periods. Many of the storage procedures listed below are common from one application to the next; however, check the owner’s manual for specific instructions.


  1. Wash and dry. Contaminants can corrode exterior surfaces, particularly chrome.
  2. Change the oil and filter. AMSOIL Synthetic Motorcycle Oil is formulated with rust inhibitors for maximum protection during storage.
  3. Stabilize the fuel. AMSOIL Gasoline Stabilizer reduces the oxidation that occurs when fuel is stored for extended periods, improving performance, extending equipment life and decreasing maintenance expenses. If storing longer than three-four months, add Gasoline Stabilizer prior to the final outing of the season to ensure complete distribution throughout the fuel system. AMSOIL Quickshot® also stabilizes fuel during short-term storage under four months. For maximum effectiveness, use Quickshot year-round.
  4. Connect a float charger or remove the battery. Doing so maintains the battery’s charge. Store the battery off the ground.
  5. Raise and cover the bike.

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