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
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
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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

4.5 stars out of 105 reviews
(4.5)|
105 ratings

Key item features

  • Advanced Cleaning: Designed to clean injectors, carburetors, valves, and combustion chamber deposits using a concentrated blend of high-temp and low-temp detergents.
  • Corrosion Prevention: Formulated to clean and prevent corrosion within the entire fuel system, enhancing its longevity and performance.
  • Fuel Efficiency: Improves gasoline stability and reduces the formation of gum and varnish, contributing to a more efficient fuel burn.
  • Octane Reduction: Capable of reducing the need for octane by up to two points, optimizing engine performance.
  • Versatile Application: One 15-ounce bottle effectively treats a full tank for neglected vehicles and can be used in smaller doses for maintenance, treating up to 100 gallons.
  • Pollution Control: Includes a synthetic upper cylinder lubricant and cleans pollution control valves for improved emissions.
  • Oxygenated Fuel: Suitable for use with oxygenated fuel and safe for continual application.
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Current price is $17.57$17.57/count
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Sold and shipped by R/A Hoerr Incorporated
4.480035492457852 stars out of 5, based on 1127 seller reviews(4.5)
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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 $17.57 $17.57/count

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
current price $17.57
$17.57/count

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

4.5 out of 5 Stars. 105 reviews

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4.5 out of 5 stars
stars105 ratings43 reviews
How item rating is calculated
  1. 5 stars75% (79)
  2. 4 stars11% (12)
  3. 3 stars8% (8)
  4. 2 stars0% (0)
  5. 1 star6% (6)

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Showing 1-3 of 43 reviews

Jan 7, 2026
TM
Top Reviewer
Item details
Size: 15 Fluid Ounce
Sold and shipped byR/A Hoerr Incorporated
5 out of 5 stars review

Verified Purchase

This stuff works./

Good product. Really good. However, since most smaller cars do not have the 20gal mixture requirement, you have to adjust how much Red Line to put in your tank per gallon. For instance, if you only put 5 gallons of gas in after adding the Red Line, be certain to limit this product to 1/4 of the bottle. (The entire bottle is used for a full 20 gal tank)

Helpful?3Q29LXTWVWGJ153463031
Oct 14, 2025
Phillip
Item details
Size: 15 Fluid Ounce
Sold and shipped byR/A Hoerr Incorporated
5 out of 5 stars review

Verified Purchase

Quick and Easy

I like doing my own maintenance, so when I did my last oil change I decided to try the Red Line Complete System Fuel Cleaner. Glad I did. After running it through a tank, the engine feels smoother and seems to have a bit more pep. Idle is steadier too. It's super easy to use, just pour it in before you fill up. No mess or weird smell. I've used a few different fuel cleaners over the years, and this one honestly stands out. If you're already taking the time to do your own oil changes, this is a nice extra step to keep your fuel system clean and running right. I'll definitely be grabbing another bottle next time.

Helpful?3Q29LXTWVWGJ153463031
Feb 1, 2026
Aky
Item details
Size: 15 Fluid Ounce
Sold and shipped byR/A Hoerr Incorporated
5 out of 5 stars review

Verified Purchase

Lasting improvements

My experience is that the positive result of this product is longer lasting than that of lucas oil. With lucas oil the mpg improvements lasts around 2 fill-ups, with Red Line, the mpg improvement has remained after 1 month. This has a higher initial cost, but is less expensive compared to lucas oil overtime. 10-year old 4 cyl daily driver.

Helpful?3Q29LXTWVWGJ153463031