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Red Line 60103 SI-1 Complete Fuel System Cleaner - 15 Ounce

4.6 4.6 out of 5 stars 5,902 ratings

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15 Fl Oz (Pack of 1)
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Purchase options and add-ons

  • DESIGNED TO EXCEED EXPECTATIONS: Red Line complete SI-1 fuel system cleaner treatment for cleaning and preventing corrosion in fuel systems
  • PERFORM AND PROTECT: Fuel additive cleans injectors, carburetors, valve and combustion chamber deposits with a powerful, concentrated blend of high-temp and low-temp detergents
  • EFFICIENT FUEL BURN: Gas treatment that enhances gasoline stability, while reducing the build up of gum and varnish formation
  • EASY TO USE: Use one bottle per tank for most effective treatment, additive cleans nearly 100% efficiency in one treatment
  • One 15 Ounce Bottle
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Product Description

Redline Oil
SI-1 COMPLETE FUEL SYSTEM CLEANER
Redline Oil
Redline Oil
Redline Oil
Redline Oil

SI-1 FUEL SYSTEM CLEANER - 15OZ

  • Cleans injectors, carburetors, valve and combustion chamber deposits with a concentrated blend of the most powerful high-temp and low-temp detergents available
  • Cleans all forms of fuel injectors, including GDI
  • Enhances fuel stability; reduces gum and varnish formation
  • Use one bottle per tank for most effective treatment, cleans to nearly 100% efficiency in one treatment
  • Reduces need for octane by up to two points
  • Contains synthetic upper cylinder lubricant
  • Cleans pollution control valves
  • Suitable for use with oxygenated fuel
  • Safe for continual use

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Red Line 60103 SI-1 Complete Fuel System Cleaner - 15 Ounce

Red Line 60103 SI-1 Complete Fuel System Cleaner - 15 Ounce


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What's in the box

  • Auto part, Automotive Accessories, Replacement and Performance parts
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    Price$16.50$12.99$8.89$12.98$4.22$12.97
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    Customer Ratings
    Easy to use
    4.8
    4.7
    4.7
    4.8
    4.7
    4.7
    Value for money
    4.4
    4.4
    4.4
    4.6
    4.7
    4.4
    Mileage
    4.3
    4.5
    4.3
    4.5
    4.6
    4.3
    Sold By
    R/A Hoerr Incorporated
    Amazon.com
    R/A Hoerr Incorporated
    Amazon.com
    Amazon.com
    Amazon.com

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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    5,902 global ratings

    Customers say

    Customers like the smoothness and ease of use of the auto accessory. For example, they mention it runs smoother, has better throttle response, and is incredibly user-friendly. They appreciate cleanliness, and quality. That said, some complain about leakage. Opinions are mixed on value, health benefits, and sound quality.

    AI-generated from the text of customer reviews

    499 customers mention457 positive42 negative

    Customers are satisfied with the quality of the auto accessory. They mention that it works great, has amazing results, and improves gas mileage and car response. Some say that the product is good but the fuel benefits didn't last longer than 1,000 miles.

    "...blend of powerful detergents and cleaning agents is designed to provide thorough and effective cleaning without causing harm to fuel system..." Read more

    "Product was good, but fuel benefits didn’t last longer than 1,000 miles. Only reason I didn’t give it 5 stars. Would say it is worth a buy though." Read more

    "...application of this product no problems whatsoever and mileage increased dependably by 2.2 mpg. I drive 300 miles each week to/from work...." Read more

    "...Great product with the maximum fuel cleaning additives." Read more

    222 customers mention199 positive23 negative

    Customers like the smoothness of the auto accessory. They say it improves engine performance and throttle response. Some customers also mention that the engine idles and runs much smoother.

    "...Aint 1960 or 1970 anymore... Anyways... RUNS NICE AND SMOOTH ON THE REDLINE. NO OTHER CLEANERS USED.So, there you have it...." Read more

    "...The result is a smoother-running engine with improved fuel combustion, leading to enhanced power and responsiveness...." Read more

    "...I’m now a forever loyal customer. You should be too. Engine runs smoother, cleaner, quieter, more efficiently. I love it!" Read more

    "I noticed an immediate increase in performance from my 3.3L V6 in my Hyundai Azera after adding one bottle to a full tank of gas...." Read more

    134 customers mention129 positive5 negative

    Customers are satisfied with the cleanliness of the auto accessory. They mention that it works well to clean the car fuel system, and is a good injector cleaner. They are also pleased with how it helps clean the gas lines and maintain fuel system cleanliness over time. They appreciate the maximum fuel cleaning additives and say it's the most useful fuel system cleaner.

    "...patterns, maybe increase VOLUME of fuel to the engine, and clean up "Ethanol poop," gas sucks nowadays, and you are a fool if you are saying that..." Read more

    "...'s ability to prevent the formation of deposits and maintain fuel system cleanliness over time contributes to the longevity of critical engine..." Read more

    "...You should be too. Engine runs smoother, cleaner, quieter, more efficiently. I love it!" Read more

    "...Great product with the maximum fuel cleaning additives." Read more

    22 customers mention22 positive0 negative

    Customers find the auto accessory easy to use. They mention it's incredibly user-friendly, and it makes starting and handling their car much easier. They also appreciate the convenience and next day shipping. Customers also say the instructions are clear and easy to follow.

    "...The ease of use is another commendable aspect of this fuel system cleaner. With a simple pour-and-go application, it's incredibly user-friendly...." Read more

    "Love the convenience and next day shipping. Thank you for caring my favorite product." Read more

    "easy and amazing product to clean the car fuel system" Read more

    "Easy to use" Read more

    83 customers mention51 positive32 negative

    Customers are mixed about the value of the auto accessory. Some mention that it's a great value, money well spent, and a proven product that saves them thousands in repair cost. Others say that it is really expensive when shipping is added and if you think you want to use this product to.

    "...Gumout at WALMART; It costs less, and is readily available;..." Read more

    "Expensive, but my bike is worth it. LOL" Read more

    "...system fouling, this product might make it better, and the purchase price is a good bet...." Read more

    "...Redline is made in USA and was cheaper than the BG, so easy choice. Redline makes premium stuff." Read more

    46 customers mention31 positive15 negative

    Customers are mixed about the health benefits of the auto accessory. Some mention it's the best fuel additive they've used for regular cleanings, and their entire fuel system will benefit. However, others say that it didn't make significant improvements on gas mileage and power performance on engine.

    "...will clean injectors, improve spray patterns, maybe increase VOLUME of fuel to the engine, and clean up "Ethanol poop," gas sucks nowadays, and you..." Read more

    "...Its effectiveness, ease of use, and positive impact on fuel efficiency make it a standout product in the automotive care market...." Read more

    "Product was good, but fuel benefits didn’t last longer than 1,000 miles. Only reason I didn’t give it 5 stars. Would say it is worth a buy though." Read more

    "...The sound is louder but its like a healthier, more powerful sound!..." Read more

    31 customers mention21 positive10 negative

    Customers are mixed about the sound quality of the auto accessory. Some mention that it improves mileage and the engine is quieter, while others say that it fixes uneven exhaust sound at idle, pinging and knocking sound.

    "...You should be too. Engine runs smoother, cleaner, quieter, more efficiently. I love it!" Read more

    "...They did not disappoint! My car also ran quieter after adding this." Read more

    "...What I wasn't expecting was that my Exhaust in my Honda was rattling around and the car rattled at stoplights and didn't rev out as smoothly...." Read more

    "...Not only did my engine sound healthier but it also ran like a champ.I have a 2008 charger with 150k miles on it...." Read more

    22 customers mention0 positive22 negative

    Customers are dissatisfied with the leakage of the auto accessory. They mention that the cap was partly open, the bottle had a broken seal, and it occasionally still floods. Some say that the seal is too far gone to help.

    "...the packaging: unless you keep it upright after opening, it will leak out of the bottle...." Read more

    "...The injectors were a mess. They were leaking so bad I had to get the oil changed every week because so much gas was leaking from the stuck injectors..." Read more

    "Ordered a two pack; both had leaked and were seeping through the box!" Read more

    "Bottle had seal broken and leaked inside box" Read more

    PASSED  MY SMOG CHECK  BUY THIS PRODUCT!!!
    5 Stars
    PASSED MY SMOG CHECK BUY THIS PRODUCT!!!
    I used this additive on a 20 year old car that I wanted to sell AND that had not passed a prior smog check.When the gas tank had 1/10th tank, I added the fuel system cleaner and ran the car a couple miles, then filled the tank to half full. After using the half tank, I went to GR8 smogcheck in a neighboring town and ... the car passed the smog test and I was able to sell it! AMAZING!!Would recommend, just add it with 1 or 2 gallons, run the car a few miles, then fill to half full with supreme gas and this stuff works!!
    Thank you for your feedback
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    Top reviews from the United States

    Reviewed in the United States on August 18, 2013
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    I have had several cars and I have come upon Redline's reputation as perhaps THE premier maker of synthetic lubes; (*cue: AMSOIL trolls, chime in now.) After doing a lot of extensive reading about motor oil on Bob Is The Oil Guy (Google it,) I became convinced that Redline was perhaps THE best oil; and while there is no "best oil," If I was going to spend big money on oil or simply wanted the best, I would choose Redline for its proven reputation with its oils, AND HAVE REMAINED SO EVEN WITH SLIGHT FORMULATION CHANGES (Read up on API SN and how it differs from API SM and API SL, etc, there is less of what was known to be the good stuff and it has been replaced with new good stuff, /endrant) - Or, perhaps, Royal Purple for a high performance, specialty oil. Honorable mentions to Mobil 1 and Pennzoil for ultra good oils as well (do you see what I did there?) On the fence about many others; nothing "wrong" with them, but why buy Castrol...

    That said, this review is not about motor oil. It is about fuel system treatment. And Redline SI-1 specifically, at that!

    Now let me tell you why I like this Redline product...

    Firstly: PEA. I forget what PEA stands for, but, as far as I know, it is about the ONLY chemical or ingredient in a fuel system cleaner or injector cleaner - four categories? Well, if it goes in the fuel, then it goes where the fuel goes... So get the strongest one....... - that ACTUALLY CLEANS. Let us make a list of those that are a SHAM, and really DONT have ANYTHING of VALUE in them:

    - STP
    - Slick 50, OLD AND NEW formula..
    - Lucas (there, I said it. I have some experiences as well as research with products from this company, not relevant to this review.)
    - Prestone
    - Pro-Long
    - SEAFOAM (!!!)
    - "Most of the shelf".. money-wasters.. makes Walmart happy..
    -- WHY? BECAUSE THYEY DO NOT HAVE PEA, or VERY LOW AMOUNTS but more like NOT, if you look at Product Data Sheets. Labels lie. Product Material Data Sheets? They don't lie.

    Now, back to WHAT WORKS: I have found that there are only three, criterion: HIGH IN PEA, therefore WORKS...

    - Gumout with REGANE (Regane is the PEA, three GUMOUT products have it: The All-In-One, the High Mileage, and another yellow liquid version, High Mileage is Orange and All In One is amber)
    - Royal Purple MaxClean (** HAS PEA; just different chemicals to MAKE it PEA;)
    - Redline SI-1.

    ^^ Now.. Out of these three, Redline has the HIGHEST amount of PEA in it. Gumout has a lot, too... And I put one Royal Purple MaxClean in my car recently. I then ran out of gas. >.< Now that wasnt the Royal Purple's fault, it was my fault. THIS TIME, I will put in the Redline SI-1.. because it may work a touch better than the Royal Purple. It also costs $5 less, so, WIN! :)

    I can't give you MPG differences, but, cars I have used it in, that seem to run smoother EVEN WITH AS LITTLE AS 1oz. PUT IN THE GAS TANK! READ THE DOSING! -YOU ONLY NEED TO PUT IN 1 ounce or so, maybe 3oz to make you feel better but that is maybe a waste, to CLEAN THE FUEL SYSTEM-- - Cars I have used it in, partial list because I honestly do not remember all the cars:

    1) 1995 Ford Taurus GL, 3.0L Vulcan, likely was a flood car, 182,000 or so miles. Could me a nice car but this one looked nice and was in good cosmetic condition with cold AC.. but was a piece of **** otherwise. Strike One for Taurus. I also had a 99 Sable that was perfect.. RAN BETTER ON FUEL SYSTEM TREATMENT OF REDLINE, JUST SMOOTHER. YOU CAN NOTICE IT IF YOU ARE TUNED TO HOW THE CARS RUNS BEFORE/AFTER WITH A TRAINED EAR AND A FEEL FOR THE CAR AND SOMETIMES TAKE NOTICE OF HOW THE CAR DRIVES WITH THE RADIO OFF AND HOW IT FEELS AND SHIFTS, PERHAPS. JUST SMOOTHER. SAME WAY WHEN YOU CHANGE OIL OR TIRES. YOU CAN TELL. *Car is gone.
    2) 2000 Volvo V70 XC AWD, ~131,000, 2.4L Turbo I5 - SAME. RAN REAL NICE ON THE REDLINE IN THE TANK. *Car is gone. And no, it wasn't the fuel injectors. Made me love and appreciate Volvos and all other finer cars, this car. Or most of. Some finer cars suck lol. Something about driver error...
    3) 1993 Chevrolet (get ready for it) "S10 Blazer Tahoe LT." Unknown mileage; engines switched due to issues (?) . RUNS LIKE A DREAM ON REDLINE. RUNS PRETTY GOOD ON GUMOUT TOO BUT REDLINE HAS THE EDGE. *Car is sitting, waiting for work. Going full build with it.
    4) 1999 Volvo V70 XC AWD, 168,850 miles, - SAME AS THE YEAR 2000 VERSION. *The Redline is going into this car. 3oz initial treatment, though I only need to put in 1oz.. maybe I will.
    5) 2003 GMC Envoy XL. 167,500 miles; 4.2I Vortec 4200. This car is abused by its mechanic, with overpriced brand new tires and 10W-40 motor oil as well as Lucas oil (straight 80 weight....... !!!!!!) when it says 5W-30 on the cap. Think about that. 5W-30 RIGHT ON THE CA.. No, er are going two or three times as thick, and calling it "better." WHAT??????????? Aint 1960 or 1970 anymore... Anyways... RUNS NICE AND SMOOTH ON THE REDLINE. NO OTHER CLEANERS USED.

    So, there you have it. This is why I will ONLY buy:

    1) Gumout at WALMART; It costs less, and is readily available;
    2) Royal Purple MaxCLEAN; This is the hardest to justify, as it costs $5 more than SI-1, has perhaps slightly not as good results, and I ran out of gas when I put it in. So I couldnt evaluate it properly.. If it runs out of gas after I put it in a half tank I am going to be a complaining consumer to the BBB but lol that wont happen... I will try that one again too, in time, with money...
    3) So far, the best of the three: This Redline SI-1.
    ^^ This was aimed at some of the posters that leave STUPID reviews! Like "My car ran out of gas. 1 star." These are the "bad review trolls" and they need to be shot and executed by the police in the street in a public forum, like Rome and stuff. These are bad people, these trolls. They need love. And they need Jesus. But notice I am not giving a product a one-star review because I ran out of gas. Take heed, lemmings.

    :)

    And, one more thing before I hit "Submit" or "Preview my review:" PEA cleans like dishes in a dishwasher. It breaks down any dirt and stuff in fuel system, and carries it away to combustion. IT DOES NOT CLOG FUEL FILTERS. Now, sure, if your fuel filter is clogged.. Will it carry stuff from it to injectors? NO! Why? because it DISSOLVES IT. Then it goes with fuel flow. So, if using in a dirty system: USE A LOT!! USE the 3 ounces or so! GIVE IT ENOUGH TO DISSOLVE THE DEBRIS AND DIRT YOU EXPECT ARE THERE! Or, better yet, change the fuel filter. It is a little tricky and you must be careful, but on a lot of cars its easy, if its not then again: CLEANER!! :)

    This product will clean injectors, improve spray patterns, maybe increase VOLUME of fuel to the engine, and clean up "Ethanol poop," gas sucks nowadays, and you are a fool if you are saying that gas doesnt leave the ethanol gummy stuff in its effort to be cheapened for maximum profit, winter-blend gas (the worst,) etc. Ethanol eats rubber and isnt good for fuel systems, so why is it in gas????........... Anyways.. Cleaners DO have a purpose.. Sure, YOUR CAR WILL RUN ON JUST GASOLINE but me myself, I believe in these products that address specific things that were overlooked in the inherent design of "just normal gas delivery."

    Did you like or dislike my review? I tried to make minimal, or no, typos. Firefox helped by having everything underlined in red that it didnt recognize, and I scanned it twice.. Let me know! :)
    310 people found this helpful
    Report
    Reviewed in the United States on December 26, 2023
    Size: 15 Fl Oz (Pack of 2)Verified Purchase
    The Red Line 60103 SI-1 Complete Fuel System Cleaner is a true game-changer when it comes to optimizing engine performance and fuel efficiency. This automotive marvel has proven itself to be an essential tool for anyone seeking to revitalize their vehicle's fuel system and unlock the full potential of their engine.

    One of the standout features of the Red Line 60103 SI-1 is its remarkable effectiveness in cleaning and maintaining the entire fuel system. Whether you drive a high-performance sports car or a daily commuter, this cleaner is designed to break down carbon deposits, varnish, and other contaminants that can hinder engine efficiency. The result is a smoother-running engine with improved fuel combustion, leading to enhanced power and responsiveness.

    The ease of use is another commendable aspect of this fuel system cleaner. With a simple pour-and-go application, it's incredibly user-friendly. Whether you're a seasoned car enthusiast or a DIY novice, the straightforward instructions make the process hassle-free. The cleaner is compatible with various fuel types, including gasoline, diesel, and ethanol blends, making it versatile for a wide range of vehicles.

    One of the most impressive outcomes of using Red Line's SI-1 is the noticeable improvement in fuel efficiency. Many users report an increase in miles per gallon (MPG) after incorporating this cleaner into their regular maintenance routine. This not only translates to potential cost savings at the pump but also contributes to a more environmentally friendly driving experience.

    The formulation of the Red Line 60103 SI-1 is noteworthy for its attention to detail. The proprietary blend of powerful detergents and cleaning agents is designed to provide thorough and effective cleaning without causing harm to fuel system components. This focus on both performance and engine safety sets Red Line apart as a trusted name in automotive care.

    Long-term engine health is a priority for any vehicle owner, and the SI-1 Fuel System Cleaner excels in this aspect. The cleaner's ability to prevent the formation of deposits and maintain fuel system cleanliness over time contributes to the longevity of critical engine components. Users appreciate the peace of mind that comes with knowing they are proactively caring for their vehicle's heart.

    In conclusion, the Red Line 60103 SI-1 Complete Fuel System Cleaner is a must-have for anyone seeking peak performance from their vehicle. Its effectiveness, ease of use, and positive impact on fuel efficiency make it a standout product in the automotive care market. Give your ride the care it deserves and let Red Line's SI-1 fuel system cleaner be the secret weapon that revitalizes your engine's performance and keeps it running smoothly for the long haul.
    4 people found this helpful
    Report
    Reviewed in the United States on March 29, 2024
    Size: 15 Fl Oz (Pack of 2)Verified Purchase
    I know nothing about cars except prices and I am fastidious about keeping mileage and other performance data. My car used to sputter pretty well all the time during the first 5 minutes after I started it. After my second application of this product no problems whatsoever and mileage increased dependably by 2.2 mpg. I drive 300 miles each week to/from work. I save 1/2 gallon per tankful sometimes closer to 3/4 gallon. I’m now a forever loyal customer. You should be too. Engine runs smoother, cleaner, quieter, more efficiently. I love it!
    Reviewed in the United States on April 3, 2024
    Size: 15 Fl Oz (Pack of 2)Verified Purchase
    Product was good, but fuel benefits didn’t last longer than 1,000 miles. Only reason I didn’t give it 5 stars. Would say it is worth a buy though.
    One person found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    Amazon Customer
    5.0 out of 5 stars engine works smoother
    Reviewed in Canada on March 17, 2024
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    It works. My 10th gen Civics' fuel consumption dropped by 0.1 lit/100 km , engine works smoother and accelerates a little better. Used a full 15 ounce bottle in an almost empty tank, filled up to 40 liters petrol, didn't refuel till tank got nearly empty to avoid dilution of the cleaner.
    One person found this helpful
    Report
    Rice
    5.0 out of 5 stars Realmente Funcional
    Reviewed in Mexico on December 20, 2022
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    El producto Red Line Complete SI-1 hace lo que promete.
    Mi auto ah aumentado en potencia, rendimiento de combustible y se ah aumentado la serenidad de mi vehículo debido a que limpia los depósitos en los inyectores, válvulas y cámara de combustión y con ello le otorga enormes beneficios a mi vehículo.
    pablo64
    5.0 out of 5 stars Producto muy eficaz
    Reviewed in Spain on April 22, 2023
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    Funciona perfecto
    Jay
    5.0 out of 5 stars Super
    Reviewed in Germany on January 9, 2022
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    Super Reinigungswirkung. Dazu gibt es auf einige YouTube Videos zum anschauen. Kann es sehr empfehlen. Lediglich der Preis ist nicht gerade günstig.
    Amazon Customer
    5.0 out of 5 stars An absolute bliss of an oil, requirement of every engine definitely
    Reviewed in India on September 6, 2021
    Size: 15 Fl Oz (Pack of 1)Verified Purchase
    An absolute bliss of product. Engine smoothens out completely and can be felt definitive. Used this vehicle for my 15 year old car (Swift), 24 year old bike (Kawasaki 125 cc, two stroke), Jawa 42 and Harley Street 750. Effect was pronounced in all vehicles and is a great product to use. Shall use this product all the time, so shall request the sellers to make available always.Every vehicle can use.....