10 Best Engine Cleaner Additives 2020

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

After analyzing products, scanning reviews, spending more than 36 hours of research and speaking with our test users, we think the Liqui Moly 2037 Pro-Line Engine Flush is the one of the Best Engine Cleaner Additive on the market.

# Image Name Brand Price
1
⭐Best Choice
Liqui Moly 2037 Pro-Line Engine Flush
Liqui Moly 2037 Pro-Line Engine Flush - 500 Milliliters Check price Liqui Moly $$$$$ Check price
2 Chevron Techron Concentrate Plus Fuel System Cleaner Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz. Check price Chevron $$$$$ Check price
3 Star Tron Enzyme Fuel Treatment Star Tron Enzyme Fuel Treatment - Concentrated Gas Formula 8 oz - Treats 128 Gallons Check price Star Brite $$$$$ Check price
4
👑Premium Pick
LUCAS LUC10013 Fuel Treatment
LUCAS LUC10013 Fuel Treatment, 1. gallons Check price LUCAS $$$$$ Check price
5
💲Best value for the money
Gumout 510011 Multi-System Tune-Up
Gumout 510011 Multi-System Tune-Up, 16 oz. Check price Gumout $$$$$ Check price
6 STA-BIL 22303 Small Engine Fuel System Cleaner STA-BIL 22303 Small Engine Fuel System Cleaner, 4. Fluid_Ounces Check price STA-BIL $$$$$ Check price
7 Red Line (60103) Complete SI-1 Fuel System Cleaner Gas and Red Line (60103) Complete SI-1 Fuel System Cleaner Gas and Injector Additive Treatment-15 oz Bottle Check price Red Line $$$$$ Check price
8 BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme Pressure Lubricant for All Vehicles Gas or Diesel Cars Trucks - 12 oz Check price BestLine Superior Lubricants $$$$$ Check price
9 Chevron Techron Fuel Injection Cleaner Chevron Techron Fuel Injection Cleaner - 12 oz. - 10055 Check price Chevron $$$$$ Check price
10 Marvel Mystery Oil MM12R Marvel Mystery Oil MM12R - 16 Fl Oz. (Pack of 2) Check price Marvel Mystery Oil $$$$$ Check price

Liqui Moly 2037 Pro-Line Engine Flush – Best Overall Engine Cleaner Additive

Liqui Moly 2037 Pro-Line Engine Flush
  • Easy way to clean and flush the oil systems of gasoline and diesel engines
  • Gentle and rapid cleaning
  • Neutral to seals and other materials installed in the engine
  • Compatible with catalytic converters
  • Simple to use

Star Tron Enzyme Fuel Treatment

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 LUC10013 Fuel Treatment – Premium Pick

LUCAS LUC10013 Fuel Treatment
  • Cleans and lubricates the fuel system. Neutralizes low sulfur fuel problems
  • Increases power and miles per gallon by burning excess exhaust emissions
  • Made in USA
  • Increases the life of pumps and injectors

Gumout 510011 Multi-System Tune-Up – Best Budget Engine Cleaner Additive

Gumout 510011 Multi-System Tune-Up
  • Use in gas, ethanol/flex fuel, diesel & biodiesel engines
  • Restores fuel economy and improves engine performance
  • PEA (polyetheramine) effectively removes carbon deposits from the entire fuel & oil systems
  • Stabilizes fuel and oil for up to 2 years
  • Helps pass emissions testing, Lubricates upper cylinders, and Fights ethanol related rust & corrosion

STA-BIL 22303 Small Engine Fuel System Cleaner

STA-BIL 22303 Small Engine Fuel System Cleaner
  • 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
  • Treats 10 gallons

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

Red Line (60103) Complete SI-1 Fuel System Cleaner Gas and
  • 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 buildup 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

BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme

BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme
  • BESTLINE ENGINE TREATMENT: Increase power/gas mileage. Injector /carb cleaner prevents engine sludge
  • REDUCES FRICTION: Nano lubricant noise remover additive creates boundary layer protection on metal
  • UNIVERSAL BESTLINE ADDITIVE: 100% Pure Synthetic use in gas or diesel car, truck, motorcycle engine
  • OIL ADDITIVE: Use 1 bottle for every 5 quarts of oil for smoother starts & maximum engine protection
  • TRY IT WITH CONFIDENCE: BestLine Engine Oil Treatment comes with a 100% money back guarantee

Marvel Mystery Oil MM12R

Marvel Mystery Oil MM12R
  • Kit Includes (2) 16oz. Bottles of Marvel Mystery Oil additive
  • Cleans and lubricates fuel injectors and carburetors
  • Reduces and prevents varnish and gum build-up
  • Prevents valve sticking and clatter
  • Prevents oil breakdown caused by extreme temperatures

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