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 124 reviews
(4.5)|
124 ratings

Key item features

  • System Cleaning: Red Line SI-1 is a complete fuel system cleaner designed to clean and prevent corrosion in fuel systems.
  • Deposit Removal: This fuel additive effectively cleans injectors, carburetors, valve, and combustion chamber deposits using a concentrated blend of high-temp and low-temp detergents.
  • Fuel Stability: The gas treatment enhances gasoline stability and reduces the formation of gum and varnish.
  • Efficient Treatment: One 15-ounce bottle provides nearly 100% cleaning efficiency in a single treatment for most effective results in neglected vehicles.
  • Octane Reduction: It can reduce the need for octane by up to two points and contains a synthetic upper cylinder lubricant.
  • Versatile Use: Suitable for use with oxygenated fuel and safe for continual use, with one bottle treating up to 100 gallons for maintenance.
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Current price is $17.57$17.57/count
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Columbus, 43215
Arrives by Tue, Mar 24
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Sold and shipped by R/A Hoerr Incorporated
4.498751040799334 stars out of 5, based on 1201 seller reviews(4.5)
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$19.99
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Shipping, arrives by Mon, Mar 23 to Columbus, 43215
Sold and shipped by OEMcycles
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Customer ratings & reviews

4.5 out of 5 stars
stars124 ratings46 reviews
How item rating is calculated
  1. 5 stars76% (94)
  2. 4 stars10% (13)
  3. 3 stars7% (9)
  4. 2 stars0% (0)
  5. 1 star6% (8)

Reviews summary

Pros
  • : Offers budget-friendly fuel system cleaning products.
  • : Provides a difference after half a tank of gas.
  • : Improves vehicle performance after addition.
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Showing 1-3 of 46 reviews

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
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
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