- Hair Type: All
- Liquid Volume: 16 Fluid Ounces
- Item Form: Oil
- Brand: Gumout
- Number of Items: 1
- Use in gas, ethanol/flex fuel, diesel & biodiesel engines
- Restores fuel economy and improves engine performance
- PEA (polyetheramine) effectively removes carbon deposits from the entire fuel & oil systems
- Stabilizes fuel and oil for up to 2 years
- Helps pass emissions testing, Lubricates upper cylinders, and Fights ethanol related rust & corrosion






















TechRN –
I had heard about this stuff from the Scotty Kilmer channel and Engineering Explained on YouTube. I have recently been on a spirit quest to do excellent preventative maintenance on my 2007 Nissan Altima 2.5 S now that I am using it for Uber and Lyft; driving about 1000 miles more a month than I used to. I read recently about the Top Tier rating system for fuel products and I realized with a sink in my stomach that for the past 37000 miles, I have been filling up at the Pilot gas station that is five minutes away from my house and it is a non-Top Tier station. My car had had no problems with the engine or fuel system and still hasn’t (knock on wood), but regardless I wanted to do something to try to correct 37000 miles of the gasoline sin of using non-Top Tier gas that lacks the amount and quality of detergents that your Top Tier stations like Shell and Chevron have.I drove my car to nearly empty and pulled into the Shell gas station nearest me. Given that I have a twenty gallon capacity tank, I dumped the entire bottle of the Gumout into my fuel tank and added a fill of gasoline–17.86 gallons–on top of it to mix it in as the instructions said to do. I then drove my car to nearly empty with the Gumout/Gas mixture and just did my second fill up with only a Top Tier gasoline.Because my car had no problems like rough idle, slow acceleration, or what have you to begin with, I cannot say I have “noticed” any difference; but that doesn’t mean there wasn’t. For seven bucks and being approved by many reputable mechanics, I don’t think my money was wasted and now that I am using Top Tier gasoline only I feel better about the longevity and reduced need for repairs my car is hopefully going to have. In summary: My car didn’t have anything noticeably wrong that would allow me to observe a noteworthy improvement, but it didn’t hurt my car either as far as I can tell; and it has the right cleaners and such for modern fuel injected vehicles.With that uninspiring part of my review over, I can now get on to the really cool NOTICEABLE benefit this stuff had: it was the Dr. Frankenstein to my mower that had been sitting unused too long!I went out to the ranch I manage to do some mowing and to my disappointment, the mower was dead and would not even start. I replaced the battery and was able to get it to start, but the idle was extremely rough and within a minute it spluttered and died. Noticing that the tank was maybe only 10% full, I went and got five gallons of fuel and added about 5 ounces of Gumout as per the instructions for four stroke small motor gasoline. I filled the mower up, shook the mower and let it sit for a minute, went to start it up, and COUGH PUTT COUGH PUTT COOUGHH VROOOOOOOOOOOOMMMMM!!!!! That baby coughed whatever gunky fuel and deposits had clogged up the fuel line or something and fired up! It ran smoothly from startup to intentional shutdown and I knew that I had the Gumout to thank for that. A further benefit of the Gumout too is that it is apparently a fuel stabilizer, so the other 2.5 gallons that is going to sit untouched in the can for up to four months is going to be good to go!All in all, I am pleased with the stuff. Be an educated purchaser: do your research and make sure it is going to be correct and useful for your application, but sometimes it is just fun to use “snake oil” type items like this and just see what happens (when they have been approved for safety by the appropriate agencies when used according to instructions, of course).Thanks for reading my review, I hope it helps you to make your purchasing decision!
RGS –
2001 Toyota Camry had been sitting for over a year with 1/4 tank of gas; 45k on odometer. I filled it up with fresh gas and drove freeway for about an hour. Car was throwing 02, EGR, EVAP, and Cat codes. Ran it down to half a tank, same codes came back even though I had cleared them. Topped off tank with 91 non-oxygenated and a can of the Gumout. Drove car for a day and then cleared codes. No codes have come back on since. Even took a 3 hour road trip and the motor purrs. So I believe it worked as advertised for me.
Daniel –
I used a full can in a 2006 Toyota Sienna with 210,000 miles and a 2013 Hyundai Sonata with 140,000 miles. Filled up tank on each vehicle immediately after adding the product. Both vehicles had a noticeable increase in MPG. I believe in this product!
joe sagliani –
This stuff works best for me. The price is less that half of what the 3 auto stores sell it for around here and it always arrives quickly. Buy it now!
Zombiexsp –
I never write reviews but saw this recommended by Scotty Kilmer on youtube. Had some issues with my transmission being a little sluggish and reviving at higher RPM. Suspected the fuel injectors and tried this as a fix. Literally within 50 miles of driving I noticed perfectly running engine again. Amazed at how quickly it worked and how cheap it was. 100/10 recommend
doug –
I used it in 5 small engines .some for winter storage and others for hands on use. seems to be doing a good job.
Kimboe –
I don’t know if it works my but my Prius has a lot of miles on it so I’m trying to do my part in keeping her healthy. This product had good reviews on YouTube.
Ray928 –
My 10 year old John Deere Twin V engine started running real rough, expecially at low speed when cold. I replaced the spark plugs, fuel pump, fuel & air filters, …, but nothing worked. I decided the carb had dirt or gum in it. I ran a couple tanks of gas thru it with this product and it is running about like new now.