Does Seafoam Actually Work in a Car? (with Proof)

Does Seafoam Actually Work in a Car? (with Proof)

Hey Guys! ChrisFix here and today we will be doing the video you have all been waiting for! Testing SeaFoam in a car engine! This is the spray that comes with the tube that goes into your intake before the throttle body. So you don’t risk hydro locking your engine. You also don’t need to remove any vacuum lines. Now to see if the engine got clean i will be using my Borescope camera to look into the engine through the spark plug holes. This will give us a undeniable before and after so we’ll visually see if the carbon in the cumbustion chamber got removed and if the piston got cleaned. I’ve done a lot of fuel system cleaner tests and i have a lot more to try but i want to make it clear, just like in my other fuel system cleaner tests I am not sponsored and I’m not getting paid. I went out and bought all of these cleaners with my own money and the results will speak for themselves. and I’m just as curious and excited as you guys to see if this stuff works or not. If you want to see my other fuel system cleaner tests, the link for those are in the description below and you can check those out after this video! so let’s stop talking and get before footage of each cylinder starting with cylinder number one… the carbon buildup in this cylinder doesn’t look bad at all but there is some carbon buildups to we will be able to check it out if we go in close you can see the difference between the top of the piston and where is has some carbon on it at the top here you can see more carbon so there is enough carbon in here for us to test the seafoam so lets check out cylinder number two! ok in cylinder number two again similar amount of carbon in similar places take a look at all the carbon around the edges of the piston there isn’t that much in the center but around the edges there is a lot we don’t have to talk about this cylinder so lets check out cylinder number three! ok so similar amounts of carbon in similar places ok and in cylinder four, carbon on the outsides and a decent amount of carbon up top you can see here is another close up look at the carbon especially around the edges of the piston so thats what the engine looks like before Seaform now lets use Seafoam and see if it removes any of the carbon so here is the Seafoam I used in the lawn mower video… and here is the stuff that we are using today… the Seafoam that we are using today has a little red hose and a spray top the red hose attaches to the Seafoam like this… and this allows us to attach the it right before the throttle body so lets go do that! so we are going to take off the rubber intake hose right here and slip this right in loosen the hose clamp and that allows us to move this and put our red tube into the intake close up the intake and tighten it down so it is sealed and now we can spray the Seafoam right into the intake and it will get sucked into the engine so we are going to start the car and hold it up to 1500 RPM… so you want to make sure that your car is fully warmed up and at operating temperature before you spray the Seafoam in so we are warmed up and ready to go! ok,I just started spraying the Seafoam and the bottle says it takes 5 minutes to completely empty. so get your pressing fingers comfortable it takes about 10 seconds before the exhaust starts smoking but then you can really see it. we will skip ahead so you don’t have to watch 5 minutes of me spraying the Seafoam and when we are low on Seafoam hold the nozzle down to spray and shut the engine off and once the engine shuts off let go off the nozzle now I will remove the red Seafoam nozzle the same way we put it in. unscrew the hose clamp lossen the rubber intake and remove the nozzle don’t forget to tighten the hose clamp again to prevent vacuum leaks so there is barely any Seafoam left and I would say we used about 90% of it so now we are going to let the car sit for 5-10 minutes and after 5-10 minutes we will start her up and let the car run until there isn’t any smoke left there should be a decent amount of smoke now which is good this will clear up give the engine a little rev to break up those carbon deposits and now lets go for a ride! the Seafoam instructions say to drive aggressively to remove any remaining carbon deposits so lets get a good run in! Nice! just really push that engine get that Seafoam thorough, break up all the carbon and lets see what we get! this car has some kick to it! What year is it? “08” its an 2008 Honda Civic Si so we are back and are waiting for the engine to cool off so i can put my camera inside the engine to see if the Seafoam actually worked in the mean time lets take a look at the sparkplugs… this is a big question that comes up and as you can see the plugs are not fouled and look the same as before we added the Seafoam which is good! now lets take a look into the engine! the moment of truth! here we go! any guesses?? This is what it looks after the Seafoam Before Seafoam… Now lets compare the two… now right away if you look at the edge of the piston compare the before and after you can see a lot of the carbon near the edge of the piston was removed you can see the ring around the edge on the after that is shiny and in the before there is all carbon buildup in addition in the areas that I circled we saw some carbon reduction from before and after now this is only 5 minutes of Seafoam its not like a headgasket leak so the piston heads aren’t squeaky clean but finally we got something with some results so this is cylinder one, we have a positive result ok, this is after Seafoam so lets get a before… Before… ok… so now lets check this out! so if you look at the edge of the piston you can see the edge of the piston got clean in all the circled areas there was cleaning when we compare the before and after… and at the bottom right side of the piston is where we have a nice amount of carbon that was removed I don’t know exactly how it works if it slowly dissovles it or if it breaks up in chunks. One would hope it slowly gets dissolved but again cylinder two we saw positive results before and after so lets get out of cylinder two and check out cylinder three so this is what it look like after the Seafoam… Before… again if we look at the edges of the piston similar trend the carbon was cleaned up if you look at the areas that are circled, those are areas where carbon was removed the bottom left hand corner had a lot of carbon removal you can see that same with the bottom right so now lets get out of cylinder 3 and check out cylinder 4… this is after Seafoam… Before… so this is interesting… if you look at the bottom of the piston head in the before and after check out the after… you can see there is a light coat of something I don’t know if it is the oil from the Seafoam or if it is carbon or whatever but you see it there and not in the Before you also see these dark spots that are in the after but not in the before… now that being said in the before on both sides of the piston there is a decent amount of hard carbon buildup and in the after that hard carbon buildup is almost all gone that is where those dark spots are so maybe that is the piston head or the carbon soaking up the oil in the Seafoam which is making it darker… I don’t know… but on the left and right edges of the piston a lot of carbon was removed so that gives you a good idea of cylinder four and there we go… we just saw the before and after for cylinders 1-4 in this straight 4 engine so does Seafoam actually work in a modern day car motor? well… you can answer that yourself by looking at the before and after pictures in all the after shots we saw the edge of the piston get clean which is a significant result in itself because that carbon can cause friction since it is so close to the piston wall that also make me think that any carbon on the piston rings themselves that we couldn’t see got cleaned off we also saw a decrease in the baked on carbon in each cylinder this Honda has 125,000 miles just like my truck and the fuel system cleaners we tried in my truck haven’t had results like this overall i’m glad we can finally say we found a cleaner that actually works we followed the instructions exactly the way they are stated on the container and got results! you can come to your own conclusions but personally i’m really excited and i’m actually impressed now that we found one good fuel system cleaner i’m getting really excited to try out other ones and to see if we can find another one… maybe something that works even better, who knows… definitely subscribe if you haven’t already for more fuel system cleaner videos as well as other how to videos and also give the video a thumbs up if you liked it!

About the Author: Michael Flood


  1. Be sure to locate the right spot to spray Seafoam because I sprayed it right before the throttle body for my 1997 Toyota Camry V6 and the bulk of the Seafoam ended up in plastic housing for the air filter. For the 1997 Toyota Camry the spot to spray it is located right at the end of the aluminum intake plenum. Remove the small rubber hose and insert the Seafoam tube in its place.

  2. Question: I have an 89 Suburban with a 350 SBC. It’s got the old throttle body fuel injector beneath the air filter. Where would I insert the tube on that motor?

  3. I get asked by friends how to take care of their car. Step one: adhere to maintenance schedule. Step 2: Seafoam. I keep no other cleaner in my garage. It's great for new cars too, dump a bottle in your gas tank every 10000 miles and 1oz per quart of oil about 100 miles BEFORE oil change.

  4. Not very impressive. Looked like the Seafoam had mainly redistributed the carbon (not that that is possible) rather than removing it

  5. Dude, use sea foam on your truck. The Honda had two less cylinders so yes the cleaning agent is going to be more concentrated on 4 cylinders than on 6!!! Not a fair test.

  6. Will the other can that you pour still be effective? I dont want a CEL to come on because a misfire 🙁

  7. I did this to my gas scooter and it did so many things like added 3 mph and sounded better, and had harder acceleration

  8. That carbon is from blowby from the pcv valve .. all that nasty blowby from the crankcase is being pulled in via vacuum from the intake manfold and being re-burned …

  9. In Australia our petrol stations have 98 octane fuel, this fuel burns at a higher heat, thus apparently cleaning fuel injectors and the motor, I'm having issues with dance at the disco idleing, I'm trouble shooting, I've done the air sensor the filter and cleaned the throttle body. A Friend of mine suggested a higher octane fuel. I will do that, right after I replaced the spark plugs and leads. Wish me luck, my car is 25 years old, but has no desire to stop😁

  10. I performed the Seafood treatment on my 2012 Fiat 500 Abarth with 77k miles on it Jun 21. Right upfront– doing this job was a pain*. For those Abarth owners: The red Seafood spray tube goes into the throttle body, *not the intake of the turbo where the air intake and turbo inlet meet, which you know is right at the bow of the engine bay. This would merely cycle the Foam through a lot of tubing and intercoolers before hitting the actual engine. The throttle body is straight buried at the back of the engine bay, and the removal of the battery and tray/ecu is required. For added fun, the Fiats leave the factory with the throttle body hose (where it connects) hose-clamped by an annoying 7mm socket clamp UPSIDE DOWN AND FACING THE WRONG DIRECTION. Getting a socket on the bolt, even with the batt tray removed, is a job for small dextrous hands that can reach in, over, and under, without seeing the target. You gotta be an ace. A huge amount of fiddling was required to have the hose clamp release. Should you make it that far, you may find that the Abarth doesn't smoke during the ingestion process. After the "hot soak" the car barely started on the 3rd try, and then I had to really punch it! It fought, and a giant evil cumulus cloud of white smoke was farted out of the pipes, but she cleared up! I now feel the car is idling better, and in general was benefited from this tedious, chemical throat-clearing of a process. Was it worth it? No. The effort of removal and entry was too much for the Fiat ABARTH.

  11. Chris I put the seafoam in through the tube think it's on the power steering something the vacuum tube waited 30 minutes started it and no smoke whatsoever I drove it home about three miles and still no smoke what's that mean it's a 1995 Aerostar van

  12. Awesome presentation. i gotta a question can i try same in 2007 kia sorento 2.5L CRDI diesel turbo engine?

  13. Hi Chris it looks like there is a difference yet a small question, where does that carbon build up go can it end up in the catalytic converter?

  14. Hey Chris, i am from Romania 🇷🇴, And i just got 97 3.8 V6 Camaro. All good, but the radio is on and you can change the station and no sound. If you put a cd inside the same, he gets out the cd and says error. Can you give some help? Thanks !

  15. Finally, video proof that there is VERY little change to the amount of carbon on the pistons. Those pistons barely had any carbon on them to begin with, and Seafoam couldn't get them clean. So if you have a dirty engine, I wouldn't waste your money on this product.

  16. Seafoam definitely works on something in my snowmobile, before i mixed it with the gas it used about 2 gallons a mile, and after i used it it gets about 15 miles a gallon

  17. I have a question: does the Diesel injector cleaner really work? Here in South Africa our Diesel quality is very bad, is it worth it to use diesel cleaner and injector cleaner? Or should I just replace cars every 4 years?

  18. I don't know the connection between white smoke and carbon. Directions say go drive aggressively. That's what clears the engine. Just add Marvel's Mystery Oil to prevent carbon in the first place. I first used Marvels to flush out my 170k Ford truck engine. I ran it out of oil and it was banging. 3 oil changes with cheap oil and extra Marvel. Ran each change about 100 miles and dump. That was 8 years ago and now I'm at 252k miles and runs great. White smoke is for kids with their first car.

  19. how about my honda civic 98 ex had old stock air intake tha black one how do i use the red hose to put it in

  20. Yo, how often can you use this seafoam? Like once a week? Idunno how bad my carbon build is but if it's bad I'm willing to hit it once a week

  21. Will seafoam damage the throttle body ? I guess it gets a little cleaning too since you pour seafoam thru it .. also some cars supposedly have special coating on the throttle I don't know for what reason. And if seafoam cleans the throttle then the special spray for throttle body is useless piece of shit

  22. Did you find out if the rest dissolved or fell off in chunks? I think I've got carbon build up which is resulting in my car pinking, I got a volvo S60. Let me know how it ran after this long term

  23. I followed your video and it cost me a fortune. The Seafoam wasn't too expensive, but buying the camera, program and laptop computer broke me.

  24. Hello
    is there any problem if i dismantle the spark plugs then i spray little bit through the Cylinder opening before turning the car on ?
    i feel its better to let the cleaner penetrates the carbon and let it be smoother

  25. I doubt ull see this but would this fix my intake manifold runner value stuck closed? Cars a 2000 ford contour 2.5L v6

  26. Acceleration when NOT under load is never a good idea… if you were going to drive it around you might as well have done it then

  27. I’m a master ase and smog repair technician you know how many guys destroy ther catalytic converters from doing it the way you just used it Chris lol you are going to ruin people’s cars kid

  28. Do ya realise what all that carbon you’re releasing as smoke in doing to the Ozone ⁉️🤔🤔🙀

  29. Seems like I see so few people mention LONG-TERM usage of SF! For many years, usually 1/month, I add 1/3 of a SF bottle to our cars half-full or less gas tanks.
    ** Another KEY is fuel-quality. I use NOTHING but Ethanol-FREE Top-Tier certified Premium.
    ** Interstate drives are HUGE!!! Get out and drive a 100 miles! Sustained runs at full-temp work wonders with a high-quality CLEANING Fuel with SF!!!
    ** If it ain't Shell V-power 0 Ethanol Premium (TT-Certified), or Holiday's Blue-Planet 0 Ethanol Premium (also TT-Certified)….. I don't buy it!
    ** At the 20y/o mark, I took my Snowblower carb apart. SPOTLESS. It's now 23! How??? When I fill my 1 gal gas-can (fuels mentioned above!), I put 1/4 cup of SF in. Therefore, it's always getting a light cleaning, & SF is a great Fuel-Stabilizer for small-engines.

  30. So what's the difference between adding the Seafoam at the point that Chris did it at the intake versus putting it in your gas as an additive?

  31. You could quantify your data by taking piston before/after photos. Convert your image to greyscale, adjust gamma to drop out the background then run the images through a pixel counter like ImageJ (freeware). It's a rough estimate due to gamma bias but you should get a decent SNR since it's black on silver (~white).

    I do this all the time as a scientist quantifying protein expression.

  32. IMO this product is used by dudes in old Dodge pickups who want to impress their Brofriend in passenger seat and share a can of Skoal.

  33. Not significant cleaning. Actually, direct injection is more the problem than anything else. Honda uses this type of injection and as a result has a problem with carbon, probably more so than other car makers. I've looked at several videos and it seems that it takes numerous attempts with Seafoam to get most of the carbon off the combustion chamber surfaces. The results shown may be more that this engine had more carbon than most, thus more carbon was removed. Not impressed.

  34. Get the same results if you put a full can in the gas tank and a splash into your engine oil. Blam clean cylinders.

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