10 bestEngine Additivesof April 2025
112M consumers helped this year.
1

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

9.9
5% off
2

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

9.8
3

Lucas 10013 Fuel Treatment - 1 Gallon
Lucas Oil

9.6
14% off
4

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

9.4
5

*H/D Oil Stabilizer/4x1/Gallon
Lucas Oil

9.2
OtherUp to 10% off
5% off
6

Liqui Moly 20004 Hydraulic Lifter Additive
Liqui Moly

9.0
13% off
7

STP Super Concentrated Fuel Injector Cleaner Fuel Additive, 155ml
STP

8.7
8

Liqui Moly 2020 Motor Oil Saver - 300 ml
Liqui Moly

8.4
11% off
9

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

8.2
7% off
10

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

7.9

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