Red Line 60103 SI-1 Complete Fuel System Cleaner Cleans and Prevents Corrosion in Fuel Systems Cleans Injectors Carburetors

Great product, really seems to clean the fuel injection system. Read more

The only thing that eliminates the DTE error in my Mustang. Cleans the Sulphur off of the float and removes ethanol buildup. My wife's picky Jaguar engine performs phenomenally better after a third of a bottle. Faster throttle response and the dreaded hesitation under heavy acceleration is eliminated. I just add the rest to my other cars because I know it is going to provide preventive measures in the long run. Read more

Summary: Red Line Complete SI-1 Fuel System Cleaner does what it claims to do. I can report two major improvements in performance, one objective and one a bit subjective. Objective improvement: 45% better gas mileage. Subjective improvement: No longer stalls going up the dreaded hill. This may be partly due to my improved skill with clutch and throttle, but I credit at least part of it to the Red Line Complete treatment. Caveat: Perhaps I am a bit generous with my “informed consumer” filters. One of the claims on the package is, “Regain lost horsepower.” Apply that filter to all of the claims. If your vehicle is performing anywhere near the manufacturer's stated performance, no, this product will not improve it. But if your vehicle is performing poorly in comparison to the manufacturer's statements, and you have any reason to suspect that it is suffering from fuel system fouling, this product might make it better, and the purchase price is a good bet. If you use this product and do not see significant improvement, you have some other problem, and you haven't lost much. If you use this product and see the improvement you want, that's a win. Details: The vehicle: I bought my daughter's disused 2005 Suzuki DS500F that had been sitting in her basement for two years, the engine only having been run briefly once a month or so to make sure it was still in running condition. I installed a new battery changed the oil and oil filter, and inflated the tires. That's it. Initial performance was horrible. After burning out the old gasoline and establishing a new baseline for mpg measurement, I got 43.6 mpg, averaged over three tankfulls, compared to the manufacturer's rating of 56.3 mpg (and some reviewers' seemingly preposterous claims of 65 mpg), and I could not climb the on-ramp from Spit Brook Road eastbound onto the Everett Turnpike northbound without stalling two or three times. Treatment: The bottle says to use the full bottle in 20 gallons of gasoline. My 4.5 gallon tank should only take about a quarter of the bottle. Conveniently, there is a notch in the label to show you the half-bottle point, which should be about right for most contemporary cars. I had to eyeball a quarter of a bottle. (I put a half-bottle in my wife's Ford Escape, but we have not been measuring its performance. Saving the remaining quarter bottle for a follow-up treatment in the bike, but it looks like it won't be needed.) I hoped to see some improvement in my first tank _after_ the treatment. In fact, I saw measurable improvement in the tank in which I used the Red Line Complete (51 mpg). (Shortly after the treatment, my speedometer broke – twice – so I had to reestablish my mpg baseline about four tanks after the treatment.) In the past five tanks after the treatment (and after the second fix to the speedometer), I am averaging 63.1 mpg. Yes, borderline preposterous, but that's why I'm using an average. The best single tank was 69.4 mpg but, OK, I could have overfilled a little on the previous tank and underfilled a little on the subsequent tank, but such errors should smooth out in the average, and it's 63.1 mpg over five tanks. Most of my driving is under highway conditions or nearly so. My daily commute is about 200 feet of city streets, three miles of limited-access highway, and two miles of 45 mph secondary roads, and the reverse for the trip home. My weekend excursions are about 20 mile round trips on secondary roads, and the occasional 260 mile round trip to the White Mountains, mostly on limited-access highways (where I got the 69.4 mpg). Not much city driving. And now I can make that left turn from a stop up a 6% grade with the engine still a little cool without stalling. That may be partly because I've gotten better with the clutch and throttle, but I think it's at least partly because of the Red Line Complete Fuel System Cleaner. I am well pleased with the product, and beyond pleased with the bike. Read more

so far it good but I will tell for sure when I get my car tuned up Read more

Works very well! Recommended by number of mechanics that did a study! I can tell it cleaned out my injectors, getting more power and better gas mileage! Read more

I like to put a whole bottle of this stuff down my tank. I own a 30 year old car and it sat for 2 years before I finally decided to use it again. Basically it was running a little rough and it was sluggish at first but after consistently using this stuff for a whole month, it fixed a particular issue in my engine. Now obviously this isn't a replacement for injectors but this helps clean up a whole lot of the gunk that's inside. One thing is I didn't run the tank empty. I'm not going to do that. but what I did do,bis that before my tank was empty like maybe less than a quarter tank left, I poured a whole bottle of this stuff in then I went and filled it up. then I went over some speed bumps to kind of shake the car up a bit to make the stuff mix. listen if it works it works and it worked and now I don't have to dig inside my engine to replace my injectors. ain't no way I'm messing with those spider injectors inside of a V6 vortec 😎 Read more

I think this is one of the best products on the market, IT WORKS! plus it also contains an upper cylinder lubricant that ALL engine can benefit from. Can't go wrong! Read more

I've worked on my own cars including tuning for years, and know that MOST over-the-counter fuel cleaners are in fact, worthless & a total waste of money. BUT....this is one of only a few that has a higher concentration of a chemical (Naphthalene) that does what is needed!! My Civic is approaching 60k and before removing the injectors for professional cleaning, I finally researched up on this and put in a bottle on very empty tank before filling up with good gas (Mobil, Exxon, Chevron - NOT cheapo gas like BJ's, Walmart, etc.). After 15 miles or so of hitting it hard before it dilluted through the system my real-time MPG increased by about 3mpg!! Don't worry that at first it'll say you're getting 8-9mpg. Once the gas ratio starts getting better and on your second tank of just gas, you'll be able to note the increased mileage. I bought a 4 bottle pack and will repeat the process every oil change or so to keep things fresh. Hopefully this keeps my injectors firing at close to full operation for much longer. If you have any doubt, do your own research. This stuff is what you want. Read more