Do Fuel Additives Work?

Fuel additives are marketed for both gasoline and diesel fuel to eliminate or manage specific performance issues of the fuel or engine, but do they actually work, what are the benefits of using them?

Fuel Additive Claims

Many of the claims that fuel additive producers make our overblown and their products do not perform as promised. Combined with marketing hype, the fuel additive of the world can be confusing, and many drivers are really skeptical or don’t know what to believe.

The truth is that fuel additives can be an effective maximize the performance and longevity of vehicles:

  • Fuel quality vary substantially from gasoline station to gasoline station. As drivers, we have no way to know exactly what we’re putting in our tanks.
  • There are specific engine performance and design issues that a quality additive can target and eliminate, such as deposit buildup in the injectors or lack of lubrication in the upper cylinder region of the engine.


AMSOIL Performance Improver (PI)

Amsoil Pi attacks and removes stubborn injector deposits that reduce power and harms fuel economy. Pi restores up to 14% of horsepower with a concentrating detergent that aggressively cleans stubborn, power-robbing deposit from injectors, valves, and the combustion chamber. In addition, removing these deposits helps control knock and reduce the need for higher octane fuels. Amsoil Pi is effective in-port and direct-injection systems and cleans the entire fuel system in one tank of gasoline.

Amsoil Upper Cylinder Lubricant (UCL)

Amsoil’s upper silicon lubricant maximize engine power and increases engine life by delivering 18% more lubricity than Lucas and 20% more than Sea Foam. That’s important because an engine top end is sparsely lubricated and prone to the development of performance-robbing deposits. It’s also highly susceptible to corrosion an issue compounded by the prevalence of ethanol in fuel. Amsoil upper cylinder lubricant uses a proprietary formulation to target those issues. Using it with every tank of gas helps retain fuel economy and performance while maximizing component life.


Amsoil dominator octane boost is recommended for all high-performance, off-road and racing applications, maximizing power and performance in all two and four stroke gasoline engines.

The benefits of AMSOIL Octane Boost are:

  • increases octane up the four numbers,
  • reduces engine knock
  • improves ignition
  • inhibits corrosion.
  • excellent as a lead substitute


AMSOIL Gasoline Stabilize (AST)

Bad gasoline is the number one reason seasonal equipment starts hard or runs rough. Gasoline breaks down in as little as 30 days, forming deposits that prevent the engine from starting or operating at peak performance. Amsoil gasoline stabilizer keeps fuel from deteriorating during storage for up to 12 months, allowing easier startups. It resists the formation of varnish and gum to keep your fuel systems and storage tanks clean. Gasoline stabilizer provides corrosion protection, helping to maintain power and performance and keeping metal looking like new, even when subjected to salt water. It is effective in ethanol blended fuel and ideal for all two and four stroke engines including cars, trucks, motorcycles, snowmobile’s boats, ATVs, tillers, trimmers, mower, snowblowers, chainsaws generators, farm and construction equipment.

AMSOIL Quickshot  (AQS)

Amsoil Quickshot  helps prevent:

  • water-induced ethanol separation and breakdown
  • cleans gummed dirty injectors and carburetor’s
  • cleans carbon deposits to restore engine performance
  • protects against the formation of gum/varnish in tanks and fuel systems.

Quick shot is designed for use in all two and four stroke gasoline powered engines including, motorcycles, snowmobile’s boats, ATV, UTV, edgers, tillers, mowers, snowblowers, chainsaws, generators and farm/construction equipment.

Amsoil Diesel Injector Clean (ADF)

For diesel power customers, Amsoil Diesel injector clean provides the lubricity the fuel pump and injectors need reducing wear, improving service life and saving time and money on maintenance cost. Fuel injector deposits interrupt spray patterns causing poor fuel atomization and incomplete combustion, excessive emissions and smoke. Diesel injector clean features advanced chemistry that delivers concentrated strength to target internal and external diesel injector deposits, helping restore horsepower and operability to like new condition.

Amsoil Diesel Cetane Boost (ACB)

Fuel with a higher cetane number provides a more complete burn, which improves performance. Amsoil diesel cetane boast increases cetane up to eight points improving the ignition quality of diesel fuel to maximize  power and fuel economy, while smoothing idle and reducing smoke and emissions. It is recommended for use in all types of heavy and light duty, on and off road and marine diesel engines.

AMSOIL Diesel Cold Flow (ADD)

Amsoil diesel cold flow combats diesel-fuel gelling by improving diesel cold flow ability. When the temperature drops, wax found in diesel fuel begins to crystallize, this is known as the “cloud point”, around 32°F for most fuels. The wax crystals eventually clog the fuel filter and starve of the engine of fuel, preventing it from starting. The point at which the crystals clog the fuel filter is known as the cold filter plugging point (CFPP). Diesel cold flow lowers the CFPP by up to 40°F in Ultra-Low Sulfur Diesel (ULSD).

Amsoil Diesel Injector Clean & Cetane Boost (ADS)

Amsoil diesel injector clean cetane boost combines the superior detergency and improved lubricity of Amsoil diesel injector clean and the increased horsepower and cetane of Amsoil diesel cetane boost. Diesel injector clean & cetane boost is engineered to keep engines and fuel systems clean. One dose delivers outstanding detergency, improved lubricity and higher cetane.

Amsoil Diesel All-In-One (ADB)

Amsoil diesel all-in-one provides outstanding protection against cold- temperature gelling and raises cetane up to four points. Diesel All-In-One features advance chemistry that targets internal diesel-injector deposits that restores horsepower and operability to like-new conditions. It combines a superior detergency and improved lubricity of Amsoil diesel injector clean and Amsoil diesel cetane boost in one convenient package. It is safe for all used in all diesel fuels, including biodiesel. Acceleration is improved with regular use and enhances performance by keeping injectors clean.

For vehicles owners who want the maximum performance and vehicle longevity, fuel additives are an essentials addition to your toolbox. AMSOIL additives have proven performance.