Didn't seem to do anything. Didn't increase gas mileage. didn't reduce engine carbon or sludge (oil looks the same). Was unsure about oil change interval after adding to oil. Called company and left Voice mail to find out, no reply from them at all. Did 3 oil changes with product including adding to fuel on a 2006 Chrysler 3.8 V6. used a total of 3 cans.

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Best value for fuel system/engine cleaning. I've used it every other oil change for a couple of years. I put one ounce per quart of oil in the crankcase and the rest in the gas tank until I need to refill, then change the oil. My engine has a known oil consumption issue but has been cut from losing a quart of oil every 1000 miles to every 2000. I do delivery/lots of idling and low-speed driving and always notice quicker starts and more steady RPM at stoplights after treatment. A separate fuel cleaner and engine flush would cost well over twice as much and be no more effective. I highly recommend this stuff over Sea Foam. As a bonus, a drop or two works great as a cleaner/lubricant/penetrating oil for chains, hinges, etc.

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Works great

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good product! anything, do %26 use anything to keep piston rings free! once they are gunked up your engine is on deaths door.

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It keeps my 96 Jimmy running smooth only using regular gas.

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Gumout Multi-System Tune-up is my go-to product to treat the gasoline in my vehicle. It is reliable and consistent.

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Works great in direct injection vehicles

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Cleaned good and saw hp go up some too. Effective.

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Works great keeping cars running.

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This particular Gumout product contains polytheramine which is the same as Techron. It dissolves carbon like hot water melts ice. You have to have a drip system to inject it into the intake manifold at a steady drip. Cleans the valves and the catalytic converter. At my shop where many cars come in with P0420 codes it solves the problem. One treatment can last as long as 6 months. No need to replace the cat if it is not broken or clogged. Vehicles with direct injection is almost every vehicle today the intake valves coke up. The engine develops a bop at idle it cleans that too. Great stuff.

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Great product for the cost @ Walmart.

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this gas additive cleans engine good

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Brought up my avg mpg from 17.1 up to 18.4

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The best product for liquid tuneup you'll ever buy

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A couple of minutes after adding this, the Check Engine light turned off.

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Keeps my truck running like new

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It works, the best out there.

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My 2017 Tacoma has new get up and go power.

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I didn't think the product would work but I noticed my car acceleration was picking up quicker. It's my "go to" when I purchase maintenence products for my car!!

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Honestly I was skeptical at first, I used so many other products on my 09 mdx with a check emissions and engine light on, I kid you not, I added the whole can to my gas tank at a quarter full, by the next morning my car car was running like new! I mean i was floored, jaw on the ground, my check emissions light and check awd system were constantly on for months, 2 mechanics couldn't get it to run normal. All I did was add this stuff and it's running like it had a hard reset back to 0! Definitely recommend this product!, like I said, I had my doubts but I'm glad to be proven wrong. All that to say, GREAT PRODUCT FOR THE PRICE!

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.....I have a 1977 Buick lesabre with a carburater and this additive really cleans very good.

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Helped alot

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Scotty Kilmer approved so I gave it a try. I don't have the bore scope evidence that Scotty has in his YT video, but truck seems to run much smoother with it.

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Doesn't have advanced PEA as described or in the product image. Misleading information. Doesn't clean as well as if it had PEA, I didn't notice a ln improvement in mpg, it did clean my cylinders slightly.

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Works great

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This is great stuff that does exactly what it says it does. I run a can with every fill up in my auto and it's running noticeably better since I began this regimen. Walmart had it at a great price, and delivery was extremely fast. I'm thoroughly please with this product and with Walmart's performance.

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Super fast delivery great price as always item arrived as described 👌

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