Best Stanadyne Fuel System Additives in 2025

STORAGE – STA-BIL Storage Fuel Stabilizer eliminates the need to drain fuel and keeps gasoline fresh for up to 24 months. Never fear your car or small engine refusing to start due to fouled fuel. This product is effective in all gasoline and ethanol blended fuels including E-10 through E-85

ENSURES QUICK, EASY STARTS – Treating your gas with this fuel stabilizer prevents gum, varnish, rust, and corrosion in your fuel tank, all of which are costly to repair. The 16 oz. bottle of this alcohol-free fuel additive treats up to 40 gallons of fuel, and it is perfect to use prior to storing either your vehicle or outdoor power equipment for an extended period

VERSATILE – STA-BIL Storage Fuel Stabilizer is safe for use in all gasoline engines, including 2-cycle. Use this fuel treatment in your vehicle, motorcycle, lawn mower, snow blower, boat, and generator

IMPROVES TOWING POWER: Helps breakdown and remove performance robbing deposits from the entire fuel system

IMPROVES ACCELERATION: Helps boost catane up to 7 points - improving efficency and throttle response

CLEANS AND LUBRICATES: Treats turbos, fuel injectors, pistons, and combustion chamber components

Cleans and Lubricates Fuel System: The product contains a blend of detergents and additives that help to clean and lubricate the fuel system, including the fuel injectors, carburetor, and combustion chamber.

Improves Fuel Economy: The product can help to improve fuel economy by removing deposits and contaminants from the fuel system and improving the efficiency of fuel combustion.

Reduces Emissions: By improving fuel combustion, the product can also help to reduce exhaust emissions, including harmful pollutants such as carbon monoxide and nitrogen oxides.

Product 1: Mixable with all commercially available motor oils

Product 1: Stable even under high thermal and dynamic permanent loads

Product 1: No deposits and absolutely compatible with all commonly used filter systems

Restore power and performance - Restores lost power and performance by removing gum, varnish, and other fuel system deposits.

Maximize fuel economy - Keeps engines clean, and protects from deposits that rob engine efficiency and reduce fuel economy.

Protect the fuel system and fuel gauge sensor from various types of corrosion - Multiple corrosion inhibitors protect metal components (both ferrous components like iron and steel, and non-ferrous components like copper and silver) from the damaging effects of corrosion.

Helps clean build-up of deposits through the entire fuel system

Helps clean pre-existing internal diesel injector deposits (idroid)

Helps restore cetane boost, improving combustion for reduced emissions and improved cold starting

Item Package Dimension: 11.749999988015L x 3.249999996685W x 3.249999996685H inches

Item Package Weight - 1.99959271634 Pounds

Item Package Quantity - 1

Prevent sludge and sediment formation

Clean & lubricate entire fuel system

Protect against corrosion

America’s #1 Ethanol Treatment

Helps prevent Ethanol fuel related damage in vehicles and small engines

Advanced formula for engines used in water environments, to better remove the moisture

Prevents Fuel From Gelling - Howes Diesel Treat is the nation’s most trusted anti-gel. Its special formula has been tested and proven time and again to prevent gelling in even the coldest weather. Owners of all types of diesel vehicles and equipment rely on the Howes family’s guaranteed product to keep them going all winter long.

Adds Lubricity - Diesel Treat helps protect against today’s Ultra Low Sulfur Diesel (ULSD) fuels by providing added lubricity to injectors, pumps, and upper cylinders. In doing so, it extends the life and increases the performance of diesel engines of all types.

Prevents Deposits - More than just an anti-gel, Diesel Treat also contains a specialized detergent package to help prevent fuel injector deposits. Carbon deposits on diesel injector systems can cause loss of engine power and other issues. Preventing these helps to improve performance and fuel economy, saving you money.

100 percent pure petroleum

EPA registered product

Liquefies gum and varnish deposits or internal engine contaminants

Hot Shot's Secret anti-gel diesel additive provides winter protection against freeze-ups, dramatically improves cold-temperature performance and contains a powerful cetane booster for a maximum improvement in performance, power and cold start speed.

This effective anti-gel additive significantly enhances cold-temperature performance and helps prevent the wax in fuel from clogging lines.

Hot Shot's Secret Diesel Winter Anti-Gel is recommended for use in all diesel engines. The anti-gel formula provides lubricity, stability, winter operability, detergency and increased cetane number to standard diesel fuels.

EXTEND THE LIFE OF YOUR VEHICLE: zMAX Engine & Fuel formulas are simple and easy to use. Micro-lubrication soaks into metal surfaces, which improves lubricity and reduces carbon deposit build-up while boosting performance and protecting vital vehicle parts.

ENGINE EFFICIENCY: Add zMAX Engine Formula to gain efficient combustion resulting in more power. Use the engine treatment at your routine oil change or every 6k miles to reduce engine wear, lower emissions and keep your engine running smoothly.

FUEL CONDITIONER: Pour zMAX Fuel Formula in the fuel tank to lubricate and maintain a clean fuel injector system. It improves fuel efficiency and performance and conditions the pumps and nozzles reducing carbon residue from the valves or pistons.

ENZYME FUEL TREATMENT – Star Tron Enzyme Fuel Treatment Concentrate improves the combustibility of all fuel - meaning more power and better fuel economy. It keeps working to clean your fuel delivery system, so your engines start easily and run strong.

STABILIZES FUEL FOR UP TO 2 YEARS – This fuel additive is ideal for everyday use and seasonal storage. It can stabilize fuel for up to 2 years and can help rejuvenate old, sub-spec fuel.

MAX PERFORMANCE – This gasoline stabilizer helps improve MPG, eliminate black soot and exhaust stains, reduce emissions, remove carbon build-up, and eliminate and prevent ethanol fuel problems for maximum performance.

The Archoil Ultimate Diesel Kit - Includes three best-sellers at a big discount

AR9100 Friction Modifier (16oz)

AR6500 Diesel Treatment (40oz) - Treats 400 Gallons (Use at every fill-up)

EXTEND THE LIFE OF YOUR VEHICLE: zMAX Multi-Purpose Formula is simple and easy to use. Micro-lubrication soaks into metal surfaces which improves lubricity and reduces carbon deposit build-up while boosting performance and protecting vital vehicle parts.

ENGINE EFFICIENCY: Use the All Purpose Formula to help to restore the combustion valve and piston ring sealing resulting in a smoother running motor and more power. Reduces engine wear and lowers emissions which improves fuel efficiency and performance.

FUEL & TRANSMISSION CONDITIONER: Helps clean varnish in valve bodies for smoother shifting, lubricates the injector system and conditions pumps & nozzles while reducing carbon residue from valves and pistons. Perfect for manual or automatic transmissions

Restores/Increase Horsepower – detergents clean deposits in the injection system

Reduces Fuel Consumption–tests show an average of 4% improvement in MPG and gains up to 9.6%

Cetane Improver – improves combustion resulting in better engine starting, running & reduced noise

Adds Protection – Increases fuel lubricity by up to 56% for an added layer of protection that keeps fuel pumps and injectors from unnecessary damage or failure

No Harmful Ingredients – LX4 is formulated without harmful solvents or alcohol making it a safe and effective fuel treatment for all systems and engines

Extends Fuel System Life – Protects any fuel system from harsh ethanol or diesel fuels and maintains a smoothly working engine and fuel system, keeping it healthy for even longer

32-oz bottle

Stops formation of gum and varnish

Keeps stored fuel fresh for quick easy starts

SIX IN ONE: Equal to a bottle of regular injector & complete fuel system cleaner, upper cylinder lubricant, fuel stabilizer and conditioner, dry gas, gas treatment and octane booster

INCREASE POWER AND PERFORMANCE: Boosts Octane, Power, Performance and Mileage, Stabilizes Gas, Lubricates and Protects

SAVE GAS: Cleans and lubricates the complete fuel system; Engine dynamometer tests show improved fuel economy

Keep Your Engine Clean - Ethanol Equalizer is an engine cleaner that cleans and lubricates your entire fuel system to increase fuel mileage and help your engine perform better under all conditions

The Ultimate Fuel Tank Cleaner - Ethanol Equalizer keeps your fuel injector cleaner, boosts octane up to 40 points, and removes water from fuel to solve all your ethanol fuel problems

Up to 3 Years of Protection - Our long-lasting formula acts as a fuel stabilizer for up to 36 months, keeping your fuel system cleaner even after years of fuel sitting in your garage

Restores/Increase Horsepower: detergents clean deposits in the injection system

Reduces Fuel Consumption tests show an average of 4 percent improvement in MPG and gains up to 9.6 Percent

Cetane Improver improves combustion resulting in better engine starting, running and reduced noise

FIXES ROUGH RUNNING ENGINES – STA-BIL Fast Fix eats away at gum and varnish that cause rough starts and no starts in your small engine equipment. This easy-to-use fuel additive combats the effects of ethanol blended gasoline

ELIMINATES WATER – This fuel injector cleaner helps to remove water that may get into your fuel system. Penetrating deep into the fuel line, this simple fuel additive prevents the need to disassemble the engine. The 8 oz. bottle of this alcohol-free fuel additive treats up to 20 gallons of fuel

VERSATILE – Compatible with all small engines, adding STA-BIL Fast Fix to your 2-cycle or 4-cycle small engine cleans carburetors and injectors while acting as a water remover. Use this product in your lawn mower, chainsaw, trimmer, snow blower, generator, and more

Contains one application of oil and fuel system UV leak detection dye

For use in engine oil transmissions power steering systems and gas and diesel fuel systems

Compatible with all weights of petroleum based lubricant

Restores/Increase Horsepower: detergents clean deposits in the injection system

Reduces Fuel Consumption tests show an average of 4 percent improvement in MPG and gains up to 9.6 Percent

Cetane Improver improves combustion resulting in better engine starting, running and reduced noise

Adds Up To 2.5x More Lubricity - With more lubricity than any other Howes product and many on the market, Diesel Defender is the ultimate choice for heavy duty vehicles. It provides protection by significantly reducing wear scars, with independent lab* results confirming Defender treated fuel outperformed the US (520mm) and more stringent European (460mm) standards. *via the wear scar test for ASTM D975 High Frequency Reciprocating Rig (HFRR)

Cleans Fuel Injectors - Uses superior IDX4 Detergent to attack and destroy even the toughest carbon deposits. When used as directed, Diesel Defender is designed to clean the entire fuel system within three treatments and prevent future deposits from forming. The removal of these deposits keeps the diesel fuel system performing optimally and increases power.

Increased Fuel Economy Guaranteed - By safely removing water, Diesel Defender leaves only pure fuel to burn. Your clean injectors then allow for a steady spray pattern, so none of that fuel is wasted. When used regularly, Diesel Defender guarantees a minimum 5% increase in fuel economy.

Clean and improve your fuel system with Small Engine Pro, a gasoline/oil additive that helps restore lost engine power and performance, by cleaning out gum and varnish

Keeps internal engine components lubricated and free, providing longevity to internal engine parts

With optimal lubrication and cleaning, this formula effectively quiets noisy engines

Includes AR6500 Diesel Treatment (40 oz)

Includes AR6400-D Diesel Fuel System Cleaner

Restore key fuel system components - injectors, turbo & dpf

Directions: Add about 1 ounce per 10 gallon of gasoline or Diesel fuel at least every 3rd to 4th fill-up on most passenger vehicles; larger engines use same amount every fill-up

Motorkote fuel optimizer is safe for use in all catalytic converters, emissions systems and diesel particulate filter

Cleans fuel system and is a great storage solution for winterizing tanks and equipment

Gas treatment and injector cleaner for use with all grades of gasoline and ethanol-blend fuel

Quickly and thoroughly removes carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns and cylinder heads

Prevents engine knocking and piston seize-up