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9 Best line additives of 2026

Save up to 16% off
  • Best Choice

    1

    Red Line 60103 SI-1 Complete Fuel System Cleaner - 15 Ounce- Fuel Injector Cleaner and Carburetor Cleaner for Corrosion Prevention and Injector, Valve, and Combustion Chamber Deposit Removal
    Red Line
    9.8
    Exceptional

    Red Line 60103 SI-1 Complete Fuel System Cleaner - 15 Ounce- Fuel Injector Cleaner and Carburetor Cleaner for Corrosion Prevention and Injector, Valve, and Combustion Chamber Deposit Removal

    • Form Factor:Fuel System Cleaner
    • Application:Cleans injectors, carburetors, valve and combustion chamber deposits
    • Efficiency:Cleans nearly 100% in one treatment
    • Bottle Size:15 Ounce
    • Corrosion Protection:Prevents corrosion in fuel systems
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  • Value for Money

    2

    Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce (2 Pack)
    Red Line
    9.5
    Excellent

    Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce (2 Pack)

    • Form Factor:N/A
    • Application:N/A
    • Efficiency:Cleans nearly 100% efficiency in one treatment
    • Bottle Size:15 Ounce
    • Corrosion Protection:N/A

  • 3

    Red Line 81403 Engine Oil Break-In Additive - 16 Ounce
    Red Line
    9.4
    Excellent

    Red Line 81403 Engine Oil Break-In Additive - 16 Ounce

    16% Off

  • 4

    Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce (4 Pack)
    Red Line
    9.2
    Excellent

    Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce (4 Pack)

  • 5

    Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)
    Red Line
    9.0
    Excellent

    Red Line 80204 WaterWetter Super Coolant - 12 Ounce (2 Pack)

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  • 6

    Red Line 60202 Lead Substitute - 12 Ounce
    Red Line
    8.7
    Very Good

    Red Line 60202 Lead Substitute - 12 Ounce

  • 7

    Red Line 70802 85 Plus Diesel Fuel Additives - 12 Ounce
    Red Line
    8.6
    Very Good

    Red Line 70802 85 Plus Diesel Fuel Additives - 12 Ounce

  • 8

    Red Line 70802 85 Plus Diesel Fuel Additives - 12 Ounce (2 Pack)
    Red Line
    8.5
    Good

    Red Line 70802 85 Plus Diesel Fuel Additives - 12 Ounce (2 Pack)

  • 9

    Red Line 70902 85-Plus Diesel Fuel Additive - 12 Ounce (12 Pack)
    Red Line
    8.4
    Good

    Red Line 70902 85-Plus Diesel Fuel Additive - 12 Ounce (12 Pack)

    • is discontinued by manufacturer: Yes
    • product dimensions: 11.2 x 8.6 x 9.3 inches
    • manufacturer part number: 70922
    • country of origin: USA
    • item weight: 10.3 pounds