10 bestFuel Additivesof February 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
Klotz Higher Octane Booster, Multipurpose Fuel Additive for Gasoline – 4 Pack of 6-Ounce Bottles
Klotz
9.4
4
STP 78574-12PK Octane Booster - 5.25 fl. oz., (Pack of 12)
STP
9.2
7% off
5
Gumout 30001 All-in-One Fuel System Cleaner 296ml
Gumout
8.9
12% off
6
Liqui Moly 2001 Valve Clean - 150 ml, Blue
Liqui Moly
8.6
7
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
8.4
5% off
8
Lucas 10020 Fuel Treatment - 5.25 oz
Lucas Oil
8.1
9
Lucas Oil 10080 Upper Cylinder Lube/Fuel Treatment - 5 Gallon Pail
Lucas Oil
7.8
10
Marvel Mystery Oil MM13R-6PK - 32 Fl Oz. (Pack of 6)
Marvel Mystery Oil
7.5
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