Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Every day 8:30AM EST - 11:00PM EST
Win Any Wheel & Tire Package! Enter Daily

SI-1 Fuel System Cleaner

Market Price $13.99 You Save 15% ($2.04)
Our Price

$11.95

FREE Shipping on orders over $49

  • Item 383777

Will this fit your Vehicle?

In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features & Details

    • Tune-Up in a Bottle
    • Cleans and Lubricates the Entire Fuel System
    • Reduces Need for Octane by Up to Two Points
    • Safe for Continual Use
    • For Use on All 1979-2014 Mustangs
    • 15 fl oz Bottle - Sold Individually
    Tune-Up In A Bottle. Red Line SI-1 Fuel System Cleaner is designed to increase power, fuel mileage and lower exhaust emissions by cleaning and lubricating your entire fuel system (including carburetor and injectors) allowing fuel to burn more efficiently for maximum power, fuel economy and fewer emissions.

    Easy To Use. Just pour one 15oz bottle directly into the fuel tank of your neglected vehicle for the most effective treatment. Use in smaller doses as routine maintenance because one 15oz bottle can treat up to 100 gallons of fuel.

    Application. Red Line SI-1 Complete Fuel System Cleaner is safe for use in all 1979-2017 Mustangs, including the LX, V6, GT, Bullitt, Mach 1, SVT Cobra, BOSS and Shelby GT500 models. Sold individually.Technical Note. Red Line Fuel Cleaner CAN NOT be shipped outside of the United States. It CAN ONLY be shipped using Ground service.

    Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) 15 fluid oz bottle
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09, 19
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 01, 03, 04
    • Cobra R - 93, 95, 00
    • EcoBoost - 15, 16, 17, 18, 19
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
    • GT350 - 15, 16, 17, 18, 19
    • GT350R - 15, 16, 17, 18, 19
    • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 79, 80, 81, 82, 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17

    You Might Also Like

    Q & A

    No questions about this product yet.

    Ask the First Question

    People Who Bought This Item Also Bought

    Customer Reviews (24) Write a Review

    Overall Rating 4.5

    out of 5 stars




    • 3/5

      September 28, 2018

      Time will tell

      Our car seemed to be running just a little rough. I have just added this to a tankful of fuel, so time will tell. The reviews I’ve read and seen are positive, so I’m hopeful.

      WilliamT

      Year: 2006 Submodel: GT

      Helpful (0)

    • 1/5

      September 11, 2018

      Not again

      I thought this would be a good product put this in with a full tank of 93 and after about 1/4 tank used check engine light came on and started miss firing until I ran that tank out and now it's normal again will be sticking with Lucas or zmaxx

      KyleW

      Year: 2007 Submodel: GT

      Helpful (0)

    • 3/5

      July 10, 2018

      My mustang prefers Lucas over Redline.

      I usually use Lucas, and the mustang loves it!.For some reason I couldn't even get the regular boost that I do with Lucas. I think I'll continue to use Lucas instead. Wanted to try it though and glad I did.

      SusieT

      Year: 1995 Submodel: V6

      Helpful (2)

    • 4/5

      June 19, 2018

      Cheap solution for a common problem

      This product is so far the best I've ever tried on my car! The engine is smooth and the instant jump at low rpm is gone. (Highly recommended).

      SalmanH

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      March 21, 2018

      Noticable Changes

      I wanted to wait a full 3,000 miles before sharing my experience with all of you. First thing is first, full exhaust, CAI, 93 tune. I notice that the throttle did become more sensitive. Hence, 0.2-0.4 MPG. I now get 9.5 city / 26.1 hwy. The reason for the HUGE gap is because I live in NYC, where there is traffic everywhere for 6 hours everyday and traffic lights every 50 meters. If I moderately step on the throttle (50), the tires will begin to spin out. Before it would take me at least 75 throttle. I haven’t had a chance to actually do 0-60s or 0-100s because of the weather, but for $12 and a 10 second “installation”, the return is pretty good. I’d recommend it to all of you.

      CamaroLOL

      Year: 2013 Submodel: V6

      Helpful (11)

    • 5/5

      February 28, 2018

      First time using Redline

      First time using Redline fuel system cleaner. I honestly can’t tell how well it’s worked bc I’m dealing with a lean bank 1 and lean bank 2 but once I get that fixed, I will add another bottle to the gas tank.

      ItMustSTANG0522

      Year: 1997 Submodel: Cobra

      Helpful (2)

    • 4/5

      February 02, 2018

      Very good

      Did a great job cleaning the fuel system out and noticeable immediately after pouring into fuel tank.

      GT08Alloy

      Year: 2008 Submodel: GT

      Helpful (2)

    • 4/5

      September 21, 2017

      As advertised

      Would've been a 5 star if not of the slow paid shipping. But this fuel cleaner surprisingly works well for my mustang. thank you :)

      Terminated

      Year: 2000 Submodel: GT

      Helpful (3)

    • 5/5

      June 05, 2017

      Fuel System Cleaner

      Good product, gas mileage when down when I ran it but once I had to fill up again, my car ran like new again.

      JT

      Year: 2014 Submodel: V6

      Helpful (2)

    • 5/5

      March 20, 2017

      Red Line SI-1 Fuel System Cleaner

      Red Line SI-1 is the BEST Fuel System Cleaner on the market. Why? it uses the highest amount of PEA's the ingredient that "Cleans" safely. Only Products with P.E.A is going to work. The rest are snake oil. My pickup and Civic run smoother, stronger and sound ALIVE. I used a full Bottle (1 oz per Gallon) and than about 1/4 bottle every fill up thereafter until next oil change. Right before Oil Change I use another bottle in a full tank. Why - the Carbon from the Cylinder Heads goes into your oil and well you want to flush that old oil out with a fresh oil change. Over time your engine will be like new. This product is 5***** Stars! I'm also getting about 3 MPG better.

      JohnM

      Year: 1993 Submodel: GT

      Helpful (7)

    • 4/5

      February 21, 2017

      Fuel System Cleaner

      Very good product work very good. I would recommend this product to some of my friends. I felt a increase in the throttle.

      GeorgeL

      Year: 2008 Submodel: GT

      Helpful (3)

    • 5/5

      February 11, 2017

      Awesome

      Instant difference in performance! I noticed improvements within minutes of driving after putting this product in my tank! Good stuff!

      DougB

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      December 10, 2016

      Great Product!

      Excellent product! Noticeable improvement in acceleration, and engine is running smoother! I recommend this product and I will purchase it again myself!

      FP

      Year: 2003 Submodel: Other

      Helpful (4)

    • 5/5

      November 30, 2016

      a must use!!!

      I used other fuel system cleaner on my cars before with out seeing any difference.... then I tried red line si-1 fuel system cleaner and I can realy see a big improvement when I press the gas pedal.. big difference.....this is the only fuel system cleaner I will use..i recommend it to anyone.....

      david

      Year: 2009 Submodel: GT

      Helpful (3)

    • 5/5

      November 03, 2016

      A must use!

      After a couple of miles of driving after pouring this into my tank then filling up I noticed a big difference in throttle response, the car was driving a lot smoother, I would recommend this product to anyone, will definitely be using at least 3 times a year!

      Sebas

      Year: 2012 Submodel: V6

      Helpful (3)

    • 5/5

      October 27, 2016

      Love it

      Made my car feel and run much better. I will continue to use this every time I do an oil change! Thanks Americanmuscle!

      Boss

      Year: 2007 Submodel: GT

      Helpful (3)

    • 5/5

      October 18, 2016

      Great product

      I put this in at fill-up, and man did this take the hesitation out of pickup my car was having and the throttle response is so much quicker. This stuff is a must buy.

      Jameon

      Year: 2014 Submodel: GT

      Helpful (4)

    • 5/5

      August 19, 2016

      Works Great

      Felt the power Instantly. Great purchase and I will buy it 3 times a year or whenever I feel a power decrease. NO MORE HESITATION IN MY CAR.

      AGuyTrynnaHaveaCooRide

      Year: 2011 Submodel: V6

      Helpful (2)

    • 5/5

      July 19, 2016

      RG.

      This is the stuff to use to clean that fuel system, even used it in a chevy.

      RG

      Year: 1987 Submodel: GT

      Helpful (3)

    • 5/5

      July 04, 2016

      Best cleaner

      I have tried many cleaners but redline has been the one that I have felt a difference Car responds more and better gas mileage After researching other cleaners it has the highest pea out there which is vital to cleaning engine

      Nlemus12

      Year: 1993 Submodel: Other

      Helpful (3)

    Related Mustang Categories