Does Seafoam Actually Work? (with Proof)

Hey guys, ChrisFix here and today we are going
to check to see how well seafoam works in a small engine like this lawnmower, before
I test this out in my car engine, I want to see if it works in a lawnmower engine. It’s
easier to test, it’s faster, and we can get a good idea of what to expect when we do this
test in a car engine. In this test we will see if seafoam actually does what it says.
we will do this by looking into the engine before the seafoam, and then seeing how much
carbon buildup is in there. And then we will run seafoam though the engine, go back in,
and see if the engine cleaner actually remove the carbon deposits. So lets get some before
footage and see what it looks like before we add the fuel cleaner. So this is a four
stroke honda engine, for a push mower. Ok, this is a single piston engine. I have the
piston pushed all the way back so we can get a good look at this. You can see the little
groves for the two valves, one is an intake valve, one is an exhaust valve. This is a
carbureted engine. You can see right near the intake and exhaust valve the engine is
pretty clean but right above that, it is all dirty, there is some carbon buildup. Lets
see if the seafoam can clean up this carbon buildup. Before we add the seafaom, you want to get the engine
nice and warm. So we are going to start it up, and let it
run for a few minutes.


  1. PszemoI October 16, 2019 at 11:31 pm

    I cannot stop wondering how much harm can a tiny layer of carbon on the piston top do to cause so much concern to actually make you spend money on SeaFoam.

  2. Keith Mullens October 17, 2019 at 1:44 am

    Is stevefix getting paid by sea my money going into seefoams snake pit pockets?

  3. Keith Mullens October 17, 2019 at 1:45 am


  4. Ezikeal October 17, 2019 at 6:32 am

    Thank you. Informative

  5. Dafi Hadi October 17, 2019 at 11:20 am

    Damn…the lawnmower vaping

  6. Wyatt Earp October 17, 2019 at 8:01 pm

    Chris, try Kreen by Kano labs. Awesome stuff

  7. Mark Ward October 17, 2019 at 9:17 pm

    I used Sea Foam in my mower and it did nothing. Then I contacted Briggs and said NEVER use any gasoline with ethanol since it will ruin the fuel system. Since I switched to no ethanol gas I have had no problems. Unless you have an inch of carbon, carbon does not affect the piston.

  8. FortWorth Rising October 18, 2019 at 6:27 am

    the first time I did this on my old toyota tacoma 5 years ago it made me so nervous.
    My old auto tech instructor said back in the 70s when he worked at a Chrysler dealership it was common practice on high mileage carbon build up vehicles to have one tech crack the throttle open at about 1,500 rpm while another tech slowly poured straight water down the throat of the carb to basically "steam clean" the top of the pistons.

  9. wayne holmes October 18, 2019 at 2:35 pm

    Thank you, I use a lot of seafoam in all of our equipment for a golf course, and I have wondered it it really works.  So, I appreciate this confirmation-

  10. Coppulor October 18, 2019 at 8:07 pm

    so for a lawnmower, would it maybe be a good idea to let it soak like you did the last time, and then stick a nylon wire brush in there to help it out? kind of like a bottle brush but a little stiffer? for that matter, how about WD40? isn't it a solvent? wouldn't that do something similar? Just asking as I am an engine ignoramus.

  11. Auto Medic October 19, 2019 at 2:36 am

    Id only use this for lawn mowers

  12. rocknexus October 19, 2019 at 7:43 am

    This a weird project farm video 🤔

  13. Rock City Marco October 19, 2019 at 1:04 pm

    Bravo my brother it works I am a little apprehensive to put something like that in my vehicle ….smaller motors I'd be willing to give it a shot

  14. razzorzedge October 19, 2019 at 1:37 pm

    this is not how you use seafoam sorry to say.. what a complete waste

  15. Steven Gorum October 19, 2019 at 4:18 pm

    Nice 🍯!!!!!! Good job!!!

  16. Tap to chat publicly October 19, 2019 at 4:52 pm

    wife thought this was hair shampoo turned her into a mermaid overnight now she lives in my bathtub.

  17. william killingsworth October 19, 2019 at 7:34 pm

    Plan water will decarb an engine. Lol keep wasting your money on snake oil.

  18. Farley's Nerdcave October 19, 2019 at 9:02 pm

    Are you the son of the Unabomber?

  19. Far Que October 20, 2019 at 3:26 am

    Don't waste your time,… it does nothing

  20. TheReuteousOne October 20, 2019 at 5:21 am

    But what do I do with the WOODER

  21. Bob Loblaw October 20, 2019 at 5:26 am

    Using my Civic to cut my lawn now

  22. steven burnham October 20, 2019 at 6:01 am

    Wondering why you added it directly and not into fuel tank like you do in cars.

  23. Angelo Matthew S. Narciso October 20, 2019 at 10:45 am

    Nice civic

  24. Jeannette Hillert October 20, 2019 at 2:01 pm

    Why are some of you people making fun of what he did? At least he tried it. I guess some of you people don't know this was very informative, to those of us, who don't know how to do this. Like me!

  25. Harry Wang October 20, 2019 at 2:16 pm

    Seafoam=whale jizz

  26. billpo October 20, 2019 at 2:38 pm

    I have been using sea foam in all my engines…from boats to snowblowers to chainsaws to lawnmowers…I just mix it in wth the gas…keeps them running great

  27. Canada! Place 2 be!! October 20, 2019 at 4:57 pm

    Seafoam killed my lawnmower

  28. Canada! Place 2 be!! October 20, 2019 at 4:59 pm

    Put in gas not direct. Its garbage.

  29. Michael Washington October 20, 2019 at 6:27 pm

    I poured Seafoam in the Sea and WOW it Clean out all the Fish and Sharks

  30. Slim Jim October 20, 2019 at 6:32 pm

    It works but I find it much easier just to run Marvel's in all my gas. From my weed eater to my truck. Side by side testing using them both directly into the intake the Marvel's cleaned better as well.

  31. Wunderbaum king _ October 20, 2019 at 6:57 pm


  32. dahlgren October 21, 2019 at 12:08 am

    How about trying ATF or distilled water to compare results.

  33. George Hugh October 21, 2019 at 3:53 am

    Gonna clean everybody out at Thanksgiving…

  34. Raymond Cortes October 21, 2019 at 5:37 am

    But seriously I remember the first time I use seafoam follow the directions and the car ran beautiful afterwards I am sold on this product I put it in every third tank not surprised what this video shows… I switched over from seafoam I used to use Marvel Mystery Oil but if you're not careful you can get a build up in the tank although I do put Marvel Mystery Oil in the crankcase and yes it works really well in there too… proof is in performance none of these products have ever let me down and I've been using them for decades

  35. Wroger Wroger October 21, 2019 at 2:43 pm

    I would have looked inside the cylinder, and then added a teaspoon of it inside the cylinder… and turned it over a few times to coat the piston, rings, valves and head, let it sit over night, and then tossed it into the fuel at a ratio of say 1 part in 75 and then gone off moving a ton of shit for 2 hours and then I would have looked into the cylinder….

  36. Kim October 21, 2019 at 4:23 pm

    I dont own a lawnmower, not even a lawn, no idea what seafoam was, how'd I get here

  37. Ray Anderson October 21, 2019 at 5:46 pm

    Actually diesel is sprayed on the engines of tanks by the onboard smoke generator to create the smoke screens.

  38. hdtvcamera1 October 21, 2019 at 7:02 pm

    Silly me, I add it to the fuel on my tractor along with ethanol free gas. It runs like new

  39. boonchan laksamee October 21, 2019 at 9:19 pm

    Work so good have money to buy me a hamburger tonight put a soda 😂😂😂

  40. Mark smith October 21, 2019 at 11:15 pm

    Why don't you change the damn filter out maybe we'll run a lot better

  41. Mark smith October 21, 2019 at 11:16 pm

    And you can add the stuff to your gas and oil dumbass…
    You don't seem to be too bright

  42. Thomas Nappo October 22, 2019 at 12:06 am

    Good job.

  43. King C October 22, 2019 at 12:53 am

    This stuff did wonders on my flux capacitor. Don't have to hit 88MPH. I can cruise through time at a cool 45MPH. Thanks seafoam.

  44. Mike McDaniels October 22, 2019 at 1:02 am

    Sea Foam is VERY GOOD for removing varnish or sludge like deposits which are blocking carburetor passageways. When gasoline evaporates, it leaves behind deposits, which usually require carburetor cleanings and re-builds. Sea Foam has saved me 10 times, from taking apart my winter damaged carburetors, here in Chicago. I use it every spring.

  45. goomgoom October 22, 2019 at 1:37 am

    not really that much of an improvement … my guess is that there would be no change in performance. It actually wasn't that bad to begin with with.

  46. brandon bailey October 22, 2019 at 2:48 am

    Awesome stuff! Thx for the video

  47. Eric Kennedy October 22, 2019 at 6:25 am

    Sea foam is shit I wouldn’t suggest using it I used it and it ruined the sensor I ended up with a big repair bill are!

  48. emma harrington October 22, 2019 at 7:27 am

    Quicker and easier to just take the head off and wire brush the piston, also didn’t even see the valves or head

  49. Eric Garman October 22, 2019 at 12:41 pm

    Geat informative video. Imma do it.

  50. steve October 22, 2019 at 1:29 pm

    Now that it's an old video , Chris do you still have that lawnmower . I like to see how piston looks now . Is there more carbon build up and how much . Did cleaning it leave a base for more then normal carbon now . ECT

  51. Dante Corvinus October 22, 2019 at 7:53 pm

    Hey Chris, could you do a review on CataClean. Ive been wondering if it truly works and if it's good for the longevity of your engine.

  52. Daniel Nixon October 22, 2019 at 8:26 pm

    Gumout is better than Sea Foam. Make sure whatever you use, you use a product with a PEA . It is a Nitrogen based cleaner product. Its a better cleaner. Just saying.

  53. Jim Helgerson October 22, 2019 at 8:49 pm

    Does it help to run mower with sea foam I the fuel tank?

  54. hotsky83 October 22, 2019 at 11:10 pm

    I've seen this on project farm once

  55. FrankySanchez _69 October 23, 2019 at 12:46 am

    Ep #690 of why the hell is this in my recommended

  56. Sean S October 23, 2019 at 1:32 am

    my pops said its good stuff so i'll take his word for it.

  57. Morgan Cooley October 23, 2019 at 4:49 am

    At last! Your video is exactly what I was expecting either yes or a no, brief, specific and clear to as why with a little mechanical background.

  58. YT 3amDaily October 23, 2019 at 8:20 am

    You always posting something I’m interested in 👍🏼

  59. ron keller October 23, 2019 at 9:55 am

    It ruined my car worthless

  60. Lwbhsl gy October 24, 2019 at 12:30 am

    Seafoam is alright but Marvel Mystery Oil is better.

  61. Clint Lewis October 24, 2019 at 12:27 pm

    What a idiot. .thats not what it's,for. ..

  62. Ferks 63 October 24, 2019 at 2:50 pm

    I’d love to live next door to him 😂 must have forgiving neighbors.

  63. Mark Holladay October 24, 2019 at 4:51 pm

    Just found your YouTube channel, the only problem is that it's 2019. And I am five lawnmowers and a few bottles of Seafoam short. Other than that you have sold me on the Seafoam, very well done.

  64. Mm Ct October 24, 2019 at 5:45 pm

    Put some coke in there see what happens lol

  65. Livesinthe Shadowsofthenight October 24, 2019 at 7:35 pm

    I always breath seafoam spray to clean all the carbon off my lungs

  66. steamcrunk October 24, 2019 at 9:23 pm

    Berryman B-12 Chemtool is half the price and works as well in my opinion. You'd have better luck spraying/pouring some of the seafoam directly into the piston cylinder chamber and let it soak in a few minutes before cranking it over. I did this on my Saab 900-S for years to decarbonize my pistons.

  67. G T October 25, 2019 at 2:07 am

    Have you tried doing that in a car by adding seafoam to the piston head and let it soak if it works the same?

  68. Topsiekku October 25, 2019 at 10:41 am

    Mitä tuo merivaahto on? 😁

  69. Gee Wilson October 25, 2019 at 11:07 am

    Look the same

  70. DJ Ratino October 25, 2019 at 12:39 pm

    It looked like it did good, but does it clean the needle valves good if you mix it in the gas? Most mowers this is what gets gummed up. Also, is this good to be in the gas to winterize?

  71. Nathan Trey October 25, 2019 at 4:04 pm

    I want to say to everyone don't use sea foam this way. Simply put 1/3 of the can mixed into the gas to clean out the carb and burn any gunk in the carb. Lil less time consuming. Same goes for a car/truck but use a full can to half! Cleans up your injectors and pistons. Same with putting it in your oil quits down valve ticks top end noise!

  72. blackdiamond92 October 25, 2019 at 7:57 pm

    No beneficial difference. I bet you damaged the engines valve stem rubber seals though

  73. Bobby Pederzani October 25, 2019 at 8:08 pm

    It worked, to an extent.. looks like you need to do it several more times to get it clean..

  74. carsutube October 26, 2019 at 1:15 am

    Do we have to use seafoam the way you did or can we just add it to our fuel source that way? If so will it clean the inside like what you did?

  75. Tracy October 26, 2019 at 4:12 am

    Nice video. You must be an engineer. If not, you should be.

  76. cape cod cynic October 26, 2019 at 1:24 pm

    Are all humans now such malevolent shitbags that nothing is off limits for ridicule? You commenters need a graveyard to haunt. Humanity doesn’t need you

  77. snakeclaw October 26, 2019 at 2:29 pm

    You are damaging your engine

  78. flipnotrab October 26, 2019 at 8:27 pm

    Your “test” isn’t really what SeaFoam is used for. Interesting none the less.

    Edit: Just FYI, product TECHRON works even better than SeaFoam. Gotta buy STRAIGHT Techron, not product that say “WITH Techron”. We’ve saved/salvaged MANY 2-stroke & 4-stroke outboard boat motors with BOTH these products. Many of which sat under saltwater for days/weeks. Lots of cleaning and flushing of motors inside and out (plus electrical flushing with WD40 and T-9 spray). Got a set of Honda 200 outboards for $100 that had been upside-down and under saltwater for over 2-3 weeks. About 4 hours on each one they ran like new. That was over 4 years ago and our buddy hung them off his boat full well knowing what condition they were in/from. He’s logged over 350+ hours on them since. He still uses SeaFoam every other tank of fuel.

  79. relpitstudios October 26, 2019 at 9:34 pm

    Doesn’t clean worth a shit

  80. Raider81 Black Hole October 27, 2019 at 12:51 am

    Junk…dont put that anywhere.

  81. SiriusGD October 27, 2019 at 2:55 pm

    Nice production.

  82. Justin Moody October 27, 2019 at 3:23 pm

    Can't believe I just now stumbled across this channel. Well presented, interesting and applicable material, without the fluff. 5.67M subscribers + 1.

  83. 17SPIKE17 October 27, 2019 at 9:42 pm


  84. John jacobjingle October 28, 2019 at 12:44 am

    I put seafoam in my pipe stretcher.. Works great

  85. paul dare October 28, 2019 at 1:50 pm

    LoL ..we use transmission fluid

  86. Mark Weller October 28, 2019 at 10:25 pm

    This is bogus BS.
    I like Seafoam when used properly, however poring ANY liquid into the intake would do the same thing. The liquid knocks off the carbon because it will not compress. Use it in the fuel tank as directed and it will do what it is supposed to do.

  87. sapreaper October 30, 2019 at 1:45 am

    use a spray bottle 🙂

  88. Dayle Spenzer October 30, 2019 at 6:09 pm

    Don't use too high of concentration of seafoam in modern cars…unless you enjoy dropping gas tanks and changing out fuel pumps!!!!!!!

  89. Tom Man October 31, 2019 at 8:32 pm

    AOC, is going to get pissed. the world will end in 6years now LOL

  90. Kevin Olesik November 2, 2019 at 8:21 pm

    use a little bottle brush to scrub the cylinder with the seafoam in it

  91. D'yer Maker November 5, 2019 at 5:07 am

    Seafoam cleaned sludge out of my turbo car's engine. It works.

  92. Chad Fortman November 5, 2019 at 6:29 am

    Throttle spray with lubricate half the price ore cheep carb spray

  93. Neo Incognito November 5, 2019 at 4:32 pm

    I put seafoam inside of my girlfriend after I came in her as a contraceptive and instead it acted as a fertilizer and she had 5 kids.

  94. DjStalin100 November 5, 2019 at 4:51 pm

    Hey bro. What kind of camera are you using to view the inside of the mower?

  95. David Hughey November 5, 2019 at 10:36 pm

    You're the man… thanks for the info Chris

  96. Dan November 5, 2019 at 10:38 pm

    I put seafoam in my seafoam

  97. Carlos-mega Robles November 6, 2019 at 8:12 pm

    I don't know about the rest of you guys but didn't look like it did jack shit to me

  98. ED November 6, 2019 at 9:39 pm

    2.1k climate nuts disliked this lol

  99. William Jeffrey November 7, 2019 at 4:06 am

    It is a good product . I use it regularly in my car

  100. Lalo Garcia November 7, 2019 at 8:17 pm

    Hey Chris . My son has a 1999 Toyota camera. An when you put the car into drive practically got to floor the brake pedal to get it to stop or pull the E break to get the car to stop . Any idea what could be the problem. Thanks

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