Gumout510011 Multi-System Tune-Up, 16 oz.

I watched a youtube video that suggested this product so thought I'd give it a try. My vehicle was purchased new and just hit 15k miles after about 2 years of Colorado driving. Noticed it was running kind of rough and there was a lag when accelerating. I assumed it was time for a scheduled maintenance but none is listed. So, tried this product and I'm truly amazed at the difference. I combined the treatment with a full tank of premium fuel - about 16 gallons - and didn't notice immediate results. But, after driving around for a few days including a highway round trip of about 150 miles, it's ridiculous how much better my vehicle runs. Smoother, quicker acceleration, and I think gas mileage has improved but I won't know until I fill the tank again in a few days. No brainer that I will make this product part of my maintenance every 5k miles

I've used Gumout Multi-System Tune Up for both my cars and small engines in my lawnmower and generator. It seems to clean the system and improve performance very quickly. I tend to use it every 7k to 10k miles in my car and with every tank in my lawnmower and generator.I especially like the fact that it is supposed to be a fuel stabilizer as well as clean the system. This has been important to me for my lawnmower and generator. Prior to using any sort of additive in my lawnmower, I had left fuel in the tank over one winter and the next Spring it would not start very easy and would run rough. I added a significant amount of Gumout to the gas and ran it about 5 minutes, though took a while to start was still running rough. Tried it again the next day and the mower worked like new. I can only imagine that the Gumout got worked into the fuel system the day before and it cleaned out the gummed up ethanol overnight. Now I add about 1 oz of Gumout to each gallon of gas for my lawnmower. Since then, it runs perfect with no problems, even when leaving gas in the tank over Winter.For my car, I can definitely notice improvement in performance after using about a quarter tank of treated gas. I am not sure about the level of PEA in the mixture, but it seems to be enough for a mid-size car with an 18 gallon tank. For large vehicles, maybe two can would be necessary.The only thing I don't like about this product is the can. I know it is modeled after the Seafoam container, but it is difficult to use when adding to a car gas tank. Other Gumout products have long neck designs that make adding to the tank easily, it would be nice if this product had that design too.

...and this little concoction gave me a few more months with old Bessie. She was pushing 200K and my mom didn't take good care of her while she was alive (my mom not Bessie the car). She sputtered. She misfired on third gear. This stuff cleaned a lot of the gunk out and Bessie kept going for another eight months before it was finally time to put her out to pasture and get a newer car. Decent product.

Great product but both cans have multiple dents - delivered by USPS and left by garage instead of front door.

This item is far the best product you pour in your car. Recently, I had an issue (found to be a sensor issue) in my car and the mechanic did a compression test. When he removed the sparkplugs inside it, it was as clean as new. This also improved the car's performance. I just rebuy this product everytime I need it. I pour it in every 3 months.

This additive has reports of increased mileage as well as improved engine performance and cleaner internal engine components. I will edit this review if/when identifiable information shows any changes.

This is like all starting fluids as far as effectiveness . The price was good and it’s a reputable company. Ether is the same so I bought because of the brand!

I recently had the engine and transmission mounts replaced in my 2006 direct injected Audi 2.0 turbo car at 218K due to idle vibrations and decided to tackle the gas fumes I had been experiencing over the past 5 years in my car while backing up. I tried Liqui Moly Jectron for a week then I came across the DI Jectron version for direct injection engines on the Liqui Moly website I tried the next week. The gas fumes changed from a gas smell to like a sweeter smell with the DI Jectron but on the last 1/4 of tank I got a P0171 code while having to slow down to about 45 mph on a mountain in traffic and then accelerating back up to speed slowly. After clearing the code and adding the Gumout Tune-Up the next morning I tried to duplicate the issue in the same area for two days on the way back from work and the code did not come back. I also noticed less friction in the fuel system with the Gumout product while slowing down and accelerating so I may have has some gunk in the system after the car mostly sat for 2 years during COVID with the ethanol fuel we have in California. The Gumout Tune-Up also cleared up the gas fumes as I am not smelling it anymore and the car is running almost like new. I will continue to use the CRC intake valve and turbo cleaner spray or the Gumout Tune-Up to clean the valves before oil changes and the Gumout Tune-Up every 2 months for the fuel system as I believe these high pressure pump systems need some kind of lubricant in them with the ethanol in the fuel. I may also use 4 ounces of Marvel Mystery oil in the tank again on regular fill ups like I used before COVID to keep the system lubricated. Gumout makes a great product at a great price.***Update the gas fume smell came back on the 3rd day of Gumout, I am going back to the Liqui Moly DIJectron.****