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 $$$$$ Check price
2 Chevron Techron Concentrate Plus Fuel System Cleaner Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz. Check price Chevron $$$$$ Check price
3 STA-BIL 22303 Small Engine Fuel System Cleaner STA-BIL 22303 Small Engine Fuel System Cleaner, 4. Fluid_Ounces Check price STA-BIL $$$$$ Check price
4 Sea Foam SF-16-2PK Motor Treatment Multi-Use Sea Foam SF-16-2PK Motor Treatment Multi-Use, 16 Ounce, Pack of 2, 16. Fluid_Ounces Check price Sea Foam $$$$$ Check price
5 LUCAS LUC10013 Fuel Treatment LUCAS LUC10013 Fuel Treatment, 1. gallons Check price LUCAS $$$$$ Check price
6
💲Best value for the money
Gumout 510011 Multi-System Tune-Up
Gumout 510011 Multi-System Tune-Up, 16 oz. Check price Gumout $$$$$ Check price
7 Marvel Mystery Oil MM12R Marvel Mystery Oil MM12R - 16 Fl Oz. (Pack of 2) Check price Marvel Mystery Oil $$$$$ Check price
8 Rislone 100QR Pack of 1 Engine Treatment Rislone 100QR Pack of 1 Engine Treatment Check price Rislone $$$$$ Check price
9 Star Tron Enzyme Fuel Treatment Star Tron Enzyme Fuel Treatment - Concentrated Gas Formula 8 oz - Treats 128 Gallons Check price Star Brite $$$$$ Check price
10
👑Premium Pick
Gumout 510014 Regane Complete Fuel System Cleaner
Gumout 510014 Regane Complete Fuel System Cleaner, 6 oz. (Pack of 6) Check price Gumout $$$$$ 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

Chevron Techron Concentrate Plus Fuel System Cleaner

Chevron Techron Concentrate Plus Fuel System Cleaner
  • Cleans, restores, protects the entire fuel system (fuel injectors, carburetors, intake valves and combustion chambers)
  • Restores: lost power, acceleration, lost fuel economy, and operation of the fuel gauge sensor
  • Reduces: rough idle, engine surge, hesitation, and spark plus fouling
  • Improves: cold start performance, and fuel stability for up to one year
  • Automobiles and trucks use every 3,000 miles or at your next oil change. All other gasoline engines use as needed (motorcycles, dirt bikes, boats, ATVs, RVs, water craft, lawn care, etc.)

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

Sea Foam SF-16-2PK Motor Treatment Multi-Use

Sea Foam SF-16-2PK Motor Treatment Multi-Use
  • Dissolves and clean fuel deposits and sticky residues from gas and diesel fuel injectors, carburetors, and combustion chambers
  • Stabilizes stored fuel for up to two year
  • Does NOT have harsh detergent or abrasive chemicals that can harm your engine

LUCAS LUC10013 Fuel Treatment

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

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

Rislone 100QR Pack of 1 Engine Treatment

Rislone 100QR Pack of 1 Engine Treatment
  • Frees valves and lifters
  • Reduces friction and wear
  • Maintains oil viscosity
  • Cleans and conditions engines
  • Dissolves and removes harmful deposits

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)

Gumout 510014 Regane Complete Fuel System Cleaner – Premium Pick

Gumout 510014 Regane Complete Fuel System Cleaner
  • Fights ethanol and water corrosion and prevents future carbon build-up
  • Conditions fuel to help extend the life of key engine parts
  • PEA (polyether amine) effectively removes carbon deposits
  • Provides maximized performance and fuel economy in one fill-up
  • Will not void OEM/manufacturer's warranty

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