- Exclusive formula cleans entire fuel system in one full tank of gas
- Removes deposits that cause hesitation, knocking and pinging, and higher exhaust emissions
- Maximizes fuel economy, restores lost power, relieves cold start problems, and improves performance and acceleration
- Designed for all gasoline engines including carbureted, 2-stroke, 4 stroke, port fuel injected and direct-injected engines
Fuel additives can help preserve and enhance your vehicle's performance when used correctly as part of a regular maintenance routine. With a variety of purposes, from cleaning fuel systems and stabilizing fuel to boosting horsepower and fuel octane rating, here are some of the best fuel additives available at O’Reilly Auto Parts® and the ways in which they can benefit your vehicle.
Best: Complete Fuel System Cleaners
When your vehicle requires deep cleaning power, a complete fuel system cleaner has specially-formulated detergents designed to attack stubborn deposits and contaminants from fuel injectors, intake valves, combustion chambers, fuel pumps, and more throughout the engine and fuel system. Using a fuel system cleaner as part of your regular maintenance can improve fuel economy, reduce knocking and acceleration hesitation, and restore vehicle performance.
- Deep Clean™ Fuel System Cleaner
- Removes carbon deposits and cleans entire intake system and combustion chamber including injectors, piston tops, intake ports, cylinder heads, and intake valves
- Improves fuel economy, reduces NOx emissions, and increases power and acceleration
- Reduces octane requirement for lower-octane fuel usage and lubricates fuel pumps, seals, and O-rings for longer life
- Specifically designed for vehicles with over 75,000 miles
- Completely cleans fuel injectors and reduces intake valve deposits
- Reduces knocking and hesitation in older vehicles and restores lost power and fuel efficiency
- Extends the life of fuel system components
- All-in-one synthetic fuel system cleaner and fuel stabilizer
- Deeply penetrates and cleans injectors or carburetors, intake valves, and combustion chambers
- Improves fuel economy and increases horsepower and reduces emissions
- Reduces deposit-related engine knocking and pinging, and prevents rough idle, hesitation, and stalling
- Superior corrosion and oxidation inhibitor stabilizes fuel during storage
- Safe for use in gasoline and diesel engines, ethanol blends, or biofuel
- Specially formulated for engines with over 75,000 miles
- PEA (polyether-amine) formula for superior carbon deposit removal
- Reduces friction in upper cylinders to improve fuel economy
- Complete formula provides deep cleaning for the entire fuel system
- Removes carbon deposits from injectors, intake valves, combustion chambers, and more
- Includes two leading types of detergent for extra-strength cleaning
- Restores performance and reduces knocking and hesitation while improving fuel economy
- High-performance cleaning formula for vehicles with over 75,000 miles
- Reduces intake valve deposits and varnish from fuel injectors in a single application
- Lubricates critical fuel system components for longer life
- Restores fuel efficiency and lowers environmental emissions
Better: Fuel Injector Cleaners
The detergents in fuel injector cleaners work to disperse fuel contaminants and carbon deposits that can build up in the fuel injectors which can accumulate and cause clogging over time. This can help restore fuel injector spray patterns and unclog ports for better vehicle performance and fuel economy.
- Fully-synthetic, high-performance complete fuel injector cleaner
- Max-Atomizer polyether amine (PEA) detergents restore 100 percent of injector flow
- Enhances power and performance and smooths rough idle
- Provides quicker and easier starts and improves fuel economy while reducing emissions
- Recommended for all ethanol blends to stabilize and reduce harmful effects
- For use in any fuel injection system on gasoline or diesel engines
- Complete fuel treatment plus injector cleaner
- Enhances the lubrication quality of reformulated gasoline and diesel
- Additives clean and lubricate fuel system components
- Eliminates carbon and varnish deposits
- Increases performance and fuel economy
- Specially formulated with jet fuel for high-quality active ingredient delivery
- Detergents dissolve and remove carbon, gum and varnish deposits
- Restores lost power and acceleration
- Smooths rough idle and eliminates tough starts
- Saves gas by cleaning fuel injectors, restoring lost fuel efficiency
- Completely cleans fuel injectors, valves, and ports
- Prevents future carbon deposit buildup
- Restores lost horsepower and fuel economy
- All-in-one complete fuel injector and carburetor cleaner
- Reduces deposits such as dirt, gum, and varnish from fuel injectors and carburetors
- Cleans key fuel system compartments including intake valves, ports, manifolds, and PCV valves
- Restores lost power and saves gas, smooths rough idle, and improves acceleration
- Reduces stalling and exhaust emissions
Good: Fuel Treatments
For basic all-around fuel system protection, fuel treatments provide enhanced fuel system component lubrication to minimize the risk of carbon and varnish buildup. Fuel treatment additives are also designed to neutralize fuel contaminants and increase the lubrication quality of gasoline for consistent and dependable fuel flow.
- Completely cleans fuel system of dirt, gum, and varnish
- Reduces intake valve deposits
- Improves fuel economy and saves gas
- Maintains smooth idle and low exhaust emissions
- Disperses water from fuel system to protect against freezing and corrosion
- Specially formulated with jet fuel for high-quality active ingredient delivery
- Improves the quality of gas with powerful cleaning agents
- Prevents the accumulation of carbon, gum, and varnish deposits
- Engineered to prevent fuel line freezing
- Saves gas by keeping fuel intake system clean
Fuel Stabilizers
When fuel sits unused in a vehicle for an extended period of time, it can lead to the development of corrosion in your fuel system components. Fuel stabilizers work to preserve your fuel, mitigate the harmful effects of ethanol, prevent the formation of gum and lacquer in your fuel system, and are recommended for any vehicle being stored for longer than three weeks. This might include seasonal equipment, secondary vehicles, recreational vehicles, collector cars, and more.
- Protects engines from gum, varnish, rust, and corrosion
- Works with all gasoline including ethanol-blended fuel up to E85
- Eliminates the need to drain fuel before storage
- Complete ethanol protection with vapor technology
- Works with gasoline, gasoline/oil mixtures, and ethanol blends
- Twice the corrosion protection and four times the fuel system detergents as traditional Sta-Bil
- Can be used in all 2- and 4-cycle marine engines
- Formulated for easier starts and smooth 2- or 4-cycle engine operation
- Protects against ethanol fuel corrosion and phase separation
- Reduces gum, varnish, and carbon deposits
Octane Boosters
Using an octane booster increases fuel octane and can help enhance your vehicle's power and fuel efficiency in custom-tuned engines and vehicles equipped with turbochargers. Always follow your vehicle manufacturer's guidelines regarding the appropriate fuel octane for use in your engine.
- Boosts horsepower and fuel economy
- Helps smooth out rough idle and engine noise or vibrations
- Reduces vehicle response lag and engine hesitation
- Increases fuel octane by up to 3 AKI (Anti-Knock Index)
- Enhances performance and fuel efficiency
- Optimizes engine response and reduces symptoms of preignition and engine knock
- High-performance octane booster for racing applications
- Max-Boost formulated for turbocharged, supercharged, and nitrous systems
- Eliminates engine-damaging detonation of low-octane fuel
- Includes fuel stabilizer for added engine corrosion protection
- Restores lost horsepower and responsiveness
- Eliminates symptoms of engine knock, hesitation, and stalling and improves performance
- Increases "anti-knock" effectiveness
- Increases fuel octane by up to 6 AKI (Anti-Knock Index) and horsepower while cleaning fuel injectors
- Improved throttle response and acceleration
- Eliminates gum and varnish build-up and symptoms of knock
- Also works as a lead substitute
Lead Additives
Using a lead substitute can help ensure extended valve life and performance in older engines. If you have a classic car that was designed to use leaded gasoline and want to ensure added protection for your softer valve seat design, then a quality lead additive can be a good option for regular use.
- Includes valve seat anti-wear additives
- Safe for all exhaust systems, including oxygen sensors or catalytic converters
- Formulated for off-road use
Diesel Fuel Additives
Understanding diesel additives is essential for maintaining your diesel engine. Whether it's regular fuel injector cleaning, preparing your truck for cold temperatures with an anti-gel, performing tank maintenance, or having a de-icer available for a roadside emergency, O'Reilly Auto Parts carries diesel additives for any season or situation.
- Total fuel injector cleaner and performance enhancer
- Boosts cetane and lubricates fuel injection components
- Restores lost power and fuel economy
- Smooths rough-running engines
- Prevents fuel gelling and keeps fuel filters from plugging with ice and wax
- Includes cetane boost for increased fuel system protection
- Provides trouble-free winter operation for diesel fuel vehicles
- Includes PetroFresh® stabilizer to keep fuel residues dispersed and diesel fuel fresh when stored for up to 12 months
- Provides excellent protection from fuel filter icing and prevents premature fuel filter clogging
- Protects against fuel tank corrosion
- Effective in all diesel fuels including biodiesel and is Ultra-Low Sulfur Diesel (ULSD) compliant at less than 15 parts per million (ppm) sulfur
- Treats up to 100 gallons
- Combine with Diesel Fuel Supplement® +Cetane Boost® anti-gel for the ultimate cold-weather protection
- De-ices frozen fuel-filters and relieves wax blockage in minutes
- Extends the life of fuel filters, fuel injection pumps and fuel injectors
- Can be used preventively to protect against fuel-filter icing
- Contains Slickdiesel® for maximum fuel lubrication - protects against Low and Ultra-Low Sulfur Diesel (ULSD) wear and contains less than 15 parts per million (ppm) sulfur
- Effective in all diesel fuels, including ULSD and biodiesel blends containing up to 20% biodiesel (B-20)
- Premium 6-in-1 diesel additive for total protection
- Safely removes and prevents Internal Diesel Injector Deposits (IDIDs), External Diesel Injector Deposits (EDID's) and other forms of varnish and deposits
- Resolves issues related to Ultra-Low Sulfur Diesel
- Powerful cetane improver increases diesel fuel cetane rating by up to seven points
- Improves combustibility, horsepower, fuel economy, and cold starts
- Lubricity enhancer to reduce wear, rust, corrosion, and excessive black smoke
- Safe for use in all diesel engines and emissions equipment
- Specially formulated synthetic cleaner blend with carbon nano lubricant for ultimate cleaning and wear protection
- Eliminates stiction (sludge) and reduces the coefficient of friction
- Use in any gasoline or diesel engine to increase fuel economy
- Combine with Diesel Extreme fuel system cleaner to restore lost engine performance
- Prevents diesel fuel from gelling and safely disperses water from diesel fuel
- Increases power and fuel economy
- Cleans and lubricates fuel injectors
- Eliminates smoking and rough idle
- Contains no alcohol or other harmful solvents
- Safe and effective in all diesel and biodiesel blends to B-20
- DPF (diesel particulate filter) friendly and warranty-safe
- Lucas Diesel Deep Clean technology brings sluggish engines back to life
- Reduces particulate matter in diesel particulate filters (DPFs) for an extended service life
- Cleans fuel injectors, restores power loss, and improves acceleration and fuel economy
- Reduces NOx emissions
- Designed for use in automotive and heavy-duty diesel engines
- Can be used at every oil change or at every fill-up
- Specifically designed to prevent cold filter plugging in diesel and biodiesel fuels
- Contains real water dispersants to effectively remove moisture from the entire fuel system
- Lowers the cold filter plugging point of ULSD and biofuels and prevents fuel thickening and gelling
- Alcohol-free additives are safe on diesel particulate filters and will not void warranties
- Completely disperses water from diesel fuel and fuel system
- Cleans the diesel injector system and reduces gum and varnish
- Stabilizes and preserves diesel fuel and prevents and eliminates sludge
- Provides cold weather protection against fuel filter icing
- Improves fuel economy and extends fuel pump and filter service life
- Reduces cylinder wall abrasion