10 Best Gas Additives 2021

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

STA-BIL Storage Fuel Stabilizer – ⭐ Best Overall Gas Additive

22207 by STA-BIL

  • Release date: 08/17/2012
  • Color: Red
  • Weight: 0.99 pounds
  • Dimensions: 14.1 x 10.5 x 9.6 inches
  • Warranty: 100% Customer Satisfaction Guaranteed
STA-BIL Storage Fuel Stabilizer
  • Keeps fuel fresh for up to 24 months during storage
  • Eliminates need to drain fuel prior to storage
  • Ensures quick, easy starts after storage
  • Effective in all gasoline, including ethanol blends
  • For all gasoline engines, including 2-cycle
  • Fit type: Universal Fit

Sea Foam SF-16 Motor Treatment

SF-16 by Sea Foam

  • Release date: 12/27/2011
  • Weight: 0.5 pounds
  • Dimensions: 2.8 x 7.5 x 2.8 inches
Sea Foam SF-16 Motor Treatment
  • Cleans injectors, carb jets and passageways
  • Cleans and lubricates intake valves, pistons and cylinders
  • Dissolves and cleans fuel residue in fuel systems
  • Dissolves oil deposits in crankcase
  • Clean timing chain tensioners and VVT actuators, quiet noisy lifters
  • 100 percent pure petroleum
  • EPA registered product
  • Liquefies gum and varnish deposits or internal engine contaminants
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions

Star Tron Enzyme Fuel Treatment

093008 by Star Brite

  • Release date: 06/11/2009
  • Weight: 0.53 pounds
  • Dimensions: 7 x 3 x 2 inches
Star Tron Enzyme Fuel Treatment
  • Cures and prevents ethanol fuel problems; helps prevent phase separation
  • For everyday use and seasonal storage; stabilizes fuel for up to 2 years and can help rejuvenate old, sub-spec fuel
  • Makes engines start easily and run smoothly; improves fuel economy and reduces emissions
  • Cleans valves and injectors of carbon deposits, gums and varnish for maximum performance, increased fuel efficiency and reduced emissions
  • Concentrated formula #930XX is economical to use in large and small applications; safe for use in all engines (including 2-cycle pre-mix)

Lucas Oil LUC10020 Fuel Treatment – 💲 Best Budget Gas Additive

LUC10020 by Lucas Oil

  • Release date: 07/06/2012
  • Color: Multi-Colored
  • Weight: 0.2 pounds
  • Dimensions: 8 x 1.4 x 1.2 inches
  • Warranty: Manufacturer Warranty
Lucas Oil LUC10020 Fuel Treatment
  • The product is 5, 25 ounces, fuel treatment, for gasoline LPG and diesel fuel, contains no alcohol/solvents/kerosene/diesel fuel, lubricates rings and cylinder walls for longer life, increases mileage, cleans and lubricates valves, pumps, carburetors, and injectors
  • Easy and simple use kit
  • The product is manufactured in China
  • A great tune-up in a bottle
  • Cleans and lubricates the fuel system
  • Neutralizes low sulfur fuel problems
  • Increases power and miles per gallon by burning excess exhaust emissions
  • Increases the life of pumps and injectors

Chevron Techron Concentrate Plus Fuel System Cleaner

65740 by Chevron

  • Release date: 09/08/2012
  • Weight: 1 pounds
  • Dimensions: 9.4 x 3.5 x 3.3 inches
  • Warranty: LIMITED WARRANTY
Chevron Techron Concentrate Plus Fuel System Cleaner
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

LUCAS LUC10013 10013 Fuel Treatment

LUC10013 by LUCAS

  • Release date: 07/29/1999
  • Color: clear yellow
  • Weight: 8 pounds
  • Dimensions: 7.2 x 5.8 x 4.9 inches
  • Warranty: Manufacturer Warranty
LUCAS LUC10013 10013 Fuel Treatment
  • Fit Type: Vehicle Specific
  • Package Dimensions: 7.23 L x 4.93 H x 5.75 W (inches)
  • Package Weight : 8 pounds
  • Country of Origin : United States

Star Tron Enzyme Fuel Treatment

14308 by Star Brite

  • Release date: 06/11/2009
  • Color: Blue
  • Weight: 0.54 pounds
  • Dimensions: 8 x 3 x 2 inches
  • Warranty: No warranty
Star Tron Enzyme Fuel Treatment
  • Cures and prevents ethanol fuel problems
  • Helps prevent phase separation
  • Makes engines start easily, run smooth
  • Stabilizes gasoline for up to 2 years
  • This item is not for sale in Catalina Island

STP Gas Treatment – 👑 Premium Pick

18039G-12PK by STP

  • Release date: 03/26/2013
  • Weight: 4.2 pounds
  • Dimensions: 8.5 x 7.5 x 6.5 inches
  • Warranty: As Labeled
STP Gas Treatment
  • Improves the quality of gasoline
  • Saves gas by keeping fuel intake system clean
  • Helps prevent fuel line freeze
  • Prevents deposit buildup
  • Compatible with cap-less fuel tanks

STA-BIL Fast Fix Small Engine Treatment

22303 by STA-BIL

  • Warranty: 100% Satisfaction Guaranteed
STA-BIL Fast Fix Small Engine Treatment
  • Fixes poor/non-running engines by eating the gum and varnish that causes rough starts, or no starts
  • Fixes issues caused by ethanol blended fuels
  • Cleans the entire fuel system - Simultaneously cleans injectors/carburetors while cleaning the rest of the fuel system
  • Prevents the need to disassemble the engine and is compatible with ALL small engines including snow blowers, lawn mowers, chainsaws, generators, and more!
  • Treats 10 gallons
  • Made in the U. S. A.

Red Line (60103) Complete SI-1 Fuel System Cleaner

(60103) by Red Line

  • Release date: 04/12/2013
  • Weight: 1 pounds
  • Dimensions: 10 x 2.3 x 2 inches
  • Warranty: Manufacturer Warranty
Red Line (60103) Complete SI-1 Fuel System Cleaner
  • Designed to exceed expectations - Red line complete SI-1 fuel system cleaner treatment for cleaning & preventing corrosion in fuel systems
  • Perform & protect - Fuel additive cleans injectors, carburetors, valve & combustion chamber deposits with a powerful, concentrated blend of high-temp and low-temp detergents
  • Efficient fuel burn - Gas treatment that enhances gasoline stability, while reducing the build up of gum and varnish formation
  • Easy to use - Use one bottle per tank for most effective treatment, additive cleans nearly 100% efficiency in one treatment
  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises

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