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 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 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.

Does what it's intended for and great price also.Not recommended for Diesel engines or engines with glow plugs.Fast shipping - Thank You!Not intended to seat/inflate new car tires.

Gumout 510011 Multi-System Tune-Up is great! I noticed smoother idling, better acceleration, and even improved fuel efficiency. It cleans injectors, stabilizes fuel, and removes carbon buildup, making it a must for any vehicle maintenance routine. I use it in my Tacoma, Corolla, Rav 4, and ATV after I change my oil I add a bottle to the gas tank and let do its thing!