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Availability:
In Stock.
Arrives
Thursday, Oct 22
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Size: 15 Fl Oz (Pack of 12)
Features
- 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
- 15 Ounce (12 Pack)
Brand: Red Line
Item Form: Liquid
Scent: Cherry
Specific Uses For Product: Bottle
Item Volume: 180 fluid ounces
Item Form: Liquid
Scent: Cherry
Specific Uses For Product: Bottle
Surface Recommendation: Valve
Special Features: Concentrated
Brand Name: Red Line
Global Trade Identification Number: 38
Manufacturer: Red Line Oil
UPC: 083522601238
Item Type Name: SI-1 Fuel System Cleaner
Model Number: 60103 CASE/12
Part Number: 60123
Item Volume: 180 fluid ounces
Unit Count: 180 Fluid Ounces
Number of Items: 12
Item Weight: 12.2 pounds
Size: 15 Fl Oz (Pack of 12)
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 22
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 15 Fl Oz (Pack of 1)
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! :)
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Reviewed in the United States on August 18, 2013 by Joseph Corbisiero
Size: 15 Fl oz (Pack of 4)
Okay I am writing this for those who keep their cars longer than 2 years: This is the good stuff. It has more PEA in it than any other fuel additive. PEA is the stuff that Chevron developed to clean engine on a molecular level. It's pricey, but you get what you pay for. And then maybe not if you buy the cheaper snake oil. If your car is running on LP then you can skip it. Oh! one more thing to consider. I am getting between 44 and 47 mpg on the highway . . . of course.
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Reviewed in the United States on August 27, 2026 by Audiomook
Size: 15 Fl Oz (Pack of 1)
I purchased the Red Line SI-1 Complete Fuel System Cleaner for my Nissan Rogue, and I’m happy with my choice. It’s easy to use and a great addition to regular vehicle maintenance. I like that it helps clean the fuel injectors and fuel system to support smooth engine performance. Red Line is a trusted brand, and this product gives me extra peace of mind when it comes to taking care of my vehicle. Great value for the money, and I would definitely recommend it to other Nissan Rogue owners!
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Reviewed in the United States on October 10, 2026 by Trent Tweddle
Size: 15 Fl Oz (Pack of 1)
Red Line SI-1 is a simple addition to routine vehicle maintenance. The 15-ounce bottle makes it easy to treat the fuel system without turning it into some complicated process—add it to the fuel tank according to the directions and let it work while you drive. I like that this is marketed as a complete fuel system cleaner rather than just an injector cleaner. It's intended to help clean deposits throughout the fuel system, including the injectors, while also helping with deposits around the combustion area. For an older or higher-mileage vehicle, products like this are especially convenient as preventative maintenance. It's inexpensive compared with having to deal with dirty injectors or fuel-system issues later, and it doesn't require taking anything apart. The bottle is also a practical size to keep in the garage and use periodically when filling up. Red Line has a strong reputation for automotive fluids and additives, which was another reason I was comfortable giving SI-1 a try. Overall: An easy and inexpensive addition to regular vehicle maintenance. If you're looking for a fuel-system treatment that goes beyond a basic injector cleaner, Red Line SI-1 is a solid choice
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Reviewed in the United States on September 8, 2026 by Daniel Byfield
Size: 15 Fl Oz (Pack of 2)
I used this in two of my commuter vehicles (a 2023 Kia Sportage and a 2024 Mirage G4). I want to give this 5 out of 5 stars, but I’m going to knock one star off because of mixed results. In my 2023 Sportage, I felt there was a noticeable difference in fuel efficiency and performance. The car I expected to see the most improvement in (the Mirage), I saw no noticeable change.
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Reviewed in the United States on September 13, 2026 by Matthew
Size: 15 Fl Oz (Pack of 2)
I wanted a fuel additive with the highest Polyetheramine concentration available for our sequential multi port injection vehicles ( 2012 Ford Fiesta SE, 253k+ miles and my 2011 Ford Ranger XL 2.3 Duratec with 92k+ and Red Line SI 1 has one of the best disclosed percentages @ 40-50%, it works phenomenally well in keeping those engines running smoothly with no hiccups at all. I also use it in our 2016 Hyundai Elantra GT that has a new engine which was installed in March 2026, right before I bought it, mainly to keep the fuel system and combustion chambers, piston tops and rings from the dreaded carbon build up that Direct Gasoline Injection engines are notorious for. The main problem with these systems is that fuel being directly injected into the combustion chambers, it doesn't wash off the carbon that builds up on the back of the intake valves which comes from blow-by inherent with engines having low tension piston rings ( something I've never been a fan of), they contaminate the oil with fuel and send oil and condensation through the PCV system and into the intake manifold and bake onto the backs of the intake valves. I change the oil in all three vehicles at 3k miles so right before I'm ready to do the oil and filter changes I let the tanks get down to 1/4 full and add Red Line to the tanks and go on the highway and perform an "Italian Tune Up" to get that PEA to do its work, and then do the oil and filter changes. Quite a lengthy review to say that Red Line SI 1 does everything the company claims, and I will use it until either these vehicles die or I do 😉
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Reviewed in the United States on September 22, 2026 by Tony Conte
Size: 15 Fl oz (Pack of 4)
Works great! Has the highest PEA percentage- pea removes carbon and other fuel deposits. Recommended to friends, they all report engines run much smoother with better acceleration, some report better fuel mileage!
Reviewed in the United States on September 29, 2026 by Larry
Size: 15 Fl Oz (Pack of 1)
Red Line is by far the best product on the market in my opinion! I use the oils in my bikes and haulers. I am the original owner of a 96 OBS that was falling on it's face when throttling up and was idling very rough! I did a full tune-up and system clean! Still sluggish but not as bad and still rough idling! When the Red Line arrived I put it in the truck and filled up! I drove it the same day for almost 200 miles. The next day I put another bottle of Red Line in it and filled up again. I drove it back home almost 200 miles and by the time I got home the truck was idling smooth and under WOT it actually got up and got out of its own way! I definitely recommend this product if you're having any sluggish throttling or rough idle. Thank you again Red Line!
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Reviewed in the United States on September 13, 2026 by Chris Milliken