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 August 2025

112M consumers helped this year.

6% off

1

Lucas 10013 Fuel Treatment - 1 Gallon

Lucas 10013 Fuel Treatment - 1 Gallon

Lucas 10013 Fuel Treatment - 1 Gallon

Lucas Oil

9.8

Buy it on Amazon

2

Liqui Moly 20004 Hydraulic Lifter Additive

Liqui Moly 20004 Hydraulic Lifter Additive

Liqui Moly 20004 Hydraulic Lifter Additive

Liqui Moly

9.6

Buy it on Amazon

3

Liqui Moly 2020 Motor Oil Saver - 300 ml

Liqui Moly 2020 Motor Oil Saver - 300 ml

Liqui Moly 2020 Motor Oil Saver - 300 ml

Liqui Moly

9.4

Buy it on Amazon

5% off

4

Liqui Moly 2009 Anti-Friction Oil Treatment-pk4

Liqui Moly 2009 Anti-Friction Oil Treatment-pk4

Liqui Moly 2009 Anti-Friction Oil Treatment-pk4

Liqui Moly

9.2

Buy it on Amazon

22% off

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

STA-BIL

8.9

Buy it on Amazon

OtherRelated productsUp to 13% off

Marvel MM14R Mystery Oil 1 Gallon

Marvel MM14R Mystery Oil 1 Gallon

Marvel Mystery Oil 32oz. (Pack 2)

Marvel Mystery Oil 32oz. (Pack 2)

Lucas Oil 10279 Engine Oil Stop Leak - 1 Gallon

Lucas Oil 10279 Engine Oil Stop Leak - 1 Gallon

STP 17174 Multipurpose Motor Treatment, 473ml

STP 17174 Multipurpose Motor Treatment, 473ml

20% off

6

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

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

8.7

Buy it on Amazon

21% off

7

Lucas Oil 10063 Engine Break-In Oil Additive - 16 oz

Lucas Oil 10063 Engine Break-In Oil Additive - 16 oz

Lucas Oil 10063 Engine Break-In Oil Additive - 16 oz

LUCAS

8.4

Buy it on Amazon

10% off

8

Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore

Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore

Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore

BG(0002698761)

8.1

Buy it on Amazon

9

Lucas Oil 10016 Complete Engine Treatment - 16 fl oz

Lucas Oil 10016 Complete Engine Treatment - 16 fl oz

Lucas Oil 10016 Complete Engine Treatment - 16 fl oz

Lucas Oil

7.9

Buy it on Amazon

38% off

10

*H/D Oil Stabilizer/4x1/Gallon

*H/D Oil Stabilizer/4x1/Gallon

*H/D Oil Stabilizer/4x1/Gallon

Lucas Oil

7.6

Buy it on Amazon

Related Reviews You Might Like

Fuel Additives

Fuel Additives

Oil Additives

Oil Additives