We use cookies to enhance the security, performance, functionality and for analytical and promotional activities. We use cookies to personalize ads for you. By continuing to browse this site you're agreeing to our Privacy PolicyWe use cookies to enhance your experience and personalize ads. By using the site, you agree to that. Privacy Policy

10 bestEngine Additivesof December 2024

112M consumers helped this year.

1

Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce
Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce

Red Line

9.9

View Product
Buy it on Amazon

2

Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml
Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml

Liqui Moly

9.8

View Product
Buy it on Amazon

3

Lucas 10013 Fuel Treatment - 1 Gallon
Lucas 10013 Fuel Treatment - 1 Gallon

Lucas Oil

9.6

View Product
Buy it on Amazon

4

Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz.
Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz.

Chevron

9.4

View Product
Buy it on Amazon

5

STA-BIL Fast Fix Small Engine Treatment - Cleans Carbs and Injectors - Fixes Rough Running Engines - Eliminates Water - Treats 10 Gallons, 4 fl. oz. (22303)
STA-BIL Fast Fix Small Engine Treatment - Cleans Carbs and Injectors - Fixes Rough Running Engines - Eliminates Water - Treats 10 Gallons, 4 fl. oz. (22303)

STA-BIL

9.2

View Product
Buy it on Amazon

Related productsUp to 5% off

STA-BIL Fast Fix - Small Engine Treatment, Cleans Carburetors and Injectors, Fixes Rough Running Engines, Eliminates Water, Treats Up to 20 Gallons, 8oz (22304), Green

STA-BIL Fast Fix - Small Engine Treatment, Cleans Carburetors and Injectors, Fixes Rough Running Engines, Eliminates Water, Treats Up to 20 Gallons, 8oz (22304), Green

View Deal
*H/D Oil Stabilizer/4x1/Gallon

*H/D Oil Stabilizer/4x1/Gallon

View Deal
Liqui Moly 2009 Anti-Friction Oil Treatment-pk4

Liqui Moly 2009 Anti-Friction Oil Treatment-pk4

View Deal
STP High Mileage Formula Oil Treatment, 443ml

STP High Mileage Formula Oil Treatment, 443ml

View Deal

6

Liqui Moly 2020 Motor Oil Saver - 300 ml
Liqui Moly 2020 Motor Oil Saver - 300 ml

Liqui Moly

8.9

View Product
Buy it on Amazon

7% off

7

Gumout 30002 Multi-System Tune-Up, 473ml
Gumout 30002 Multi-System Tune-Up, 473ml

Gumout

8.7

View Product
Buy it on Amazon

8

Liqui Moly 20004 Hydraulic Lifter Additive
Liqui Moly 20004 Hydraulic Lifter Additive

Liqui Moly

8.4

View Product
Buy it on Amazon

14% off

9

STP 17174 Multipurpose Motor Treatment, 473ml
STP 17174 Multipurpose Motor Treatment, 473ml

STP

8.1

View Product
Buy it on Amazon

10

4 cans of BG Engine Performance Restoration 109
4 cans of BG Engine Performance Restoration 109

Ferrari

7.8

View Product
Buy it on Amazon
subscribe-icon

Best Reviews Guide Newsletter

Get exclusive articles, recommendations, shopping tips, and sales alerts

By submitting your email address you agree to our Terms and Conditions and Privacy Policy