Gasoline Fuel Additives Improve Performance

AMSOIL gasoline fuel additives improve fuel economy, power and performance.

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AMSOIL P.i.® Performance ImproverAMSOIL Upper Cylinder LubricantAMSOIL Gasoline Stabilizer
Brad Nelson
by Brad Nelson
March 13, 2023

Store shelves are chock-full of gasoline additives that claim to increase fuel economy, smooth engine operation, reduce emissions, extend engine life, maximize horsepower and more.

Let’s review the lineup of AMSOIL gasoline fuel additives, usage scenarios for each product and some data showing how much they improve performance.

AMSOIL P.i.® Performance Improver

Over time, carbonaceous deposits form on your engine’s fuel injectors, valves and in the combustion chamber. Injectors are highly engineered to tight tolerances, and even minute deposits interfere with the spray pattern, reducing power and fuel economy. Fouling can also lead to increased engine wear.

The problem is especially pronounced in gasoline direct-injection (GDI) engines that locate the injectors inside the combustion chamber where they are exposed to intense heat. In fact, direct injection typically creates 30 to 40 times more soot than port-fuel injectors (PFI). Eventually, you notice a reduction in power, throttle response, fuel economy and drivability.

AMSOIL P.i. cleans injectors, valves and the combustion chamber, improving performance.

AMSOIL P.i. contains concentrated detergent that aggressively cleans stubborn deposits from injectors, valves and the combustion chamber – restoring up to 14% horsepower.1 P.i. restores GDI fuel injectors to a 100% flow rate after just one tank of fuel.2

AMSOIL Upper Cylinder Lubricant

Your engine’s top end is sparsely lubricated and prone to the development of deposits. That’s because the intense heat of combustion and limitations of the oil-control piston ring result in a lack of oil at the top of each cylinder. This can lead to ring and cylinder wear that reduces engine compression, decreasing power and performance.

AMSOIL Upper Cylinder Lubricant reduces cylinder wear and corrosion.

The top end is also highly susceptible to corrosion, an issue compounded by the prevalence of ethanol in fuel and its propensity to attract water. AMSOIL Upper Cylinder Lubricant fights ethanol-related corrosion using potent corrosion inhibitors to coat metal surfaces, block out moisture and stop deterioration before it starts.

In other words, AMSOIL Upper Cylinder Lubricant inhibits corrosion and reduces wear in the engine’s top end to guard against compression loss and maintain peak horsepower.

AMSOIL Gasoline Stabilizer

Shockingly, gasoline can start to break down in as little as 30 days. Gums and varnish become more concentrated and less soluble as lighter hydrocarbons evaporate. In addition, gas is continually oxidizing, which adds varnish and other gunk to the mixture. As the transformation progresses, gums, varnish and other solids foul the fuel system and prevent gas from flowing into the combustion chamber.

In severe cases, gasoline can change so dramatically that it no longer ignites. For example, ethanol is added to most gasoline at the refinery. Ethanol absorbs water from the air, which leads to phase separation where the ethanol and gas separate and form distinct layers. Ethanol that has absorbed enough moisture and has sat long enough can foul the fuel system and prevent the engine from starting.

For these reasons, it’s vital to stabilize fuel prior to storage. Proactively adding fuel stabilizer is a simple and inexpensive way to head off more serious downtime and repairs down the road.

AMSOIL Gasoline Stabilizer prevents varnish and gum, so your engine will start.

AMSOIL Gasoline Stabilizer improves gasoline stability for up to 12 months so your vehicles and equipment fire up immediately when you take them out of storage. It also protects against corrosion during storage to maintain fuel-system cleanliness.

We recommend adding AMSOIL Gasoline Stabilizer to your gas can with every fill. That way you never have to worry about fuel going bad inside your gas can, or worse, inside your powersports toys, lawnmowers, chainsaws or other equipment that’s stored for extended periods.

AMSOIL Quickshot®

Frequently, equipment ends up in storage for several months without a fuel stabilizer, so it either won’t start or runs poorly due to contaminated fuel. AMSOIL Quickshot features specifically designed chemistry to restore engine performance by cleaning gummed or dirty injectors and carburetors as well as removing carbon deposits from piston tops, spark plugs and other combustion-chamber parts.

AMSOIL Quickshot also helps prevent water-induced ethanol separation and breakdown and protects against the formation of gum and varnish buildup in tanks and fuel systems for up to six months.

AMSOIL Quickshot cleans gummed or dirty injectors, carburetors and pistons. 

Diesel Fuel Additives

In addition to industry-leading gasoline additives, AMSOIL also offers a complete line of diesel fuel additives. For peak performance, diesel engines need a daily dose of detergent for cleaning and lubricity to protect the injectors and fuel pump while keeping the combustion chamber clean. Here’s a brief introduction to each product.

AMSOIL Diesel Injector Clean uses unique chemistry to target and eliminate specific performance issues to maximize diesel power. It cleans dirty injectors to restore power and torque and reduce smoke and emissions. It also lubricates pumps and injectors to reduce wear, downtime and maintenance costs.

AMSOIL Diesel Cold Flow combats diesel-fuel gelling by improving diesel cold-flow ability. It is formulated with an advanced deicer to enhance fuel flow and help prevent fuel-filter plugging in cold temperatures.

AMSOIL Diesel Cetane Boost raises the cetane number of diesel fuel up to eight points for maximum horsepower, increased fuel economy and easier starts in all diesel engines.

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 Cetane Boost.

AMSOIL Diesel All-In-One puts the benefits of AMSOIL Diesel Injector Clean, Diesel Cold Flow and Diesel Cetane Boost into one convenient package. Diesel All-In-One delivers outstanding detergency, improved lubricity and higher cetane. It also does a great job preventing fuel gelling in cold weather.

By understanding how each AMSOIL fuel additive works, you’ll be able to keep your vehicle and equipment engines running at peak performance when you need them most.

by Brad Nelson

Brad Nelson is a staff writer for AMSOIL. Outside of work he enjoys family adventures, wilderness exploration and riding/wrenching on vintage metric motorcycles.

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AMSOIL P.i.® Performance ImproverAMSOIL Upper Cylinder LubricantAMSOIL Gasoline Stabilizer