10 bestEngine Additivesof May 2026
112M consumers helped this year.
1
Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce
Red Line
9.8
2
Lucas 10013 Fuel Treatment - 1 Gallon
Lucas Oil
9.6
3
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
9.3
10% off
4
3 cans of BG EPR Engine Performance Restoration
BG(0002698761)
9.0
10% off
5
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
6
Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore
BG(0002698761)
8.4
7
Liqui Moly (20002) Cera Tec Friction Modifier - 300 ml
Liqui Moly
8.1
5% off
8
*H/D Oil Stabilizer/4x1/Gallon
Lucas Oil
7.8
9
Lucas Oil 10279 Engine Oil Stop Leak - 1 Gallon
Lucas Oil
7.6
10
Lucas Oil 10063 Engine Break-In Oil Additive - 16 oz
LUCAS
7.3
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