Seafoam vs Marvel Mystery Oil! The Ultimate Showdown!

  • Published on: 09 May 2017
  • I test the legendary Marvel Mystery Oil and compare it to Seafoam results from previous videos. You get to decide which product is superior!
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  • Runtime : 10:
  • SLICK 50 SLICK 50 Seafoam additive oil crankcase lock up sea foam lucas marvel mystery oil marvels marvel mystery oil engine believe seefoam Sea foam Seefoam See Foam seafome noisy lifter does seafoam work engine rebuild smoke vibration shake knock carbon carbon buildup oil consumption compression lifter repair lifter sea compression test test mystery prolong zmax amsoil synthetic


  • gremmann
    gremmann   2 hours ago

    Looked to me like the MMO cleaned the head better. Got more of the carbon off. Here's one for you, MMO or Stabil for storage. Hmmm

  • marathonman
    marathonman   1 days ago

    I actually use both in all cars or trucks i have owned. the results are fantastic if you pour in one bottle of each in the tank along with octane booster then fill with premium gas to compensate for the garbage that comes out. i have literally has engines run better then when the previous owner had them. when i show them this they can not believe their eyes and ears as to how smooth the engine is.if you do this every one to two months your engine will be butter smooth always. everyone should know by now that Big Oil puts additive to gum up engines including incorporating Butyl into gasoline. YES, you heard that right Butyl rubber into gasoline. real gasoline is water clear. Trust me when i say Big Oil is as crooked as they come.

  • Herb Jorgensen
    Herb Jorgensen   2 days ago

    Well a 2001 Ford f250 7.3 liter diesel has yet to be opened at all with no injector change at 293,000 miles,I use MMO every oil change and almost every fuel,I have used sea foam before but only during high humidity to combat moisture.Actually prefer Diesel clean.MMO can be used in fuel or oil,where as seafoam cannot.What ever you do DO NOT use sea-foam in the oil of a diesel as it will destroy the seals in a high pressure oil unit in less than 250 miles.So in my opinion Marvel Mystery Oil is the best and time tested additive to use.Gas or Diesel.If you go back and look at the comparisons in the video it shows it with out a doubt.

  • The Mexican Joker
    The Mexican Joker   2 days ago

    mmo is my beard oil, when it's -27 outside it reduces ice build up and it smells great.

  • leroy Reed
    leroy Reed   3 days ago

    What do you think is better B12 or mystery I would love to know your opinion thank you

  • Chris Murray
    Chris Murray   3 days ago

    JB weld is awesome but I bet money it won't fix a cylinder head! It's not good on stuff that vibrates for long periods of time.

  • DanB
    DanB   3 days ago

    Love the video! You are what I aspire to be :D

  • Pete Conz
    Pete Conz   4 days ago

    I give Marvel Mistery oil my vote. I'm an old school guy anyway. Thanks for the video.

  • joseph pockey
    joseph pockey   4 days ago

    I’m not sure if you will be able to do this but I’m interested in how well amsoil engine oil and diesel treatment work in my Cummins .

  • 69 Mercury Cyclone
    69 Mercury Cyclone   5 days ago

    Love this video! I go with the MMO on this test. More carbon removed than Sea Foam.

  • Zack Leiby
    Zack Leiby   5 days ago

    It really seems like marvel mystery oil looks alot better to me

  • Watchdog
    Watchdog   5 days ago

    Going back into ancient history...I had a new 1970 Monte Carlo with a 327. The engine was very tight, poor quality control back then (not case now). Engine had about 500 miles on it and a lifter stuck thanks to varnish from excess friction/heat. I thought the engine threw a rod it was knocking so loud. Tow truck to the garage. Mechanic said, you're not going to believe this...added a quart of Marvel tot he crankcase, then pulled off the air cleaner, starting the knocking engine and slowly poured Marvel direct into the carb. In less that one minute the stuck lifter started to move and within 2 minutes the engine was running quietly! Had I not seen it with my own eyes I would have thought they were lying to me (customary in that era!!!).Next, my 23 year old mower with a Kohler engine starting giving carb trouble, figured I needed a rebuild kit. Remembered the 70 Chevy...added Marvel to the gas for 2 more refills and the engine ran smooth vs. surging and stalling ! Ever since i have added an ounce to every tank and the carb continues (6 years later!!!) running smoothly!People laugh at me and tell me that newer products work better...really? How much better do you need ??? IT WORKS!However, the thorough test you show...I was not impressed with the results on either.

  • living in a desert
    living in a desert   5 days ago

    I did my own test..seafoam in fuel tank 3 times..oil change fresh plugs. Mmo 3 times an oil change and fresh plugs on a 454 7.4l... Mmo gave the engine life..used same gas station same pump..mmo won for me.

  • kulifrunsen
    kulifrunsen   6 days ago

    I really enjoy watching your videos, you do a phenomenal work editing, testing and explaining . You look very sincere and polite. Please keep up the great work.

  • Robert Lee
    Robert Lee   6 days ago

    I've used both on an 11 y.o. truck with great results. But the MMO, I've read, is not good for cat converters,Is there truth to this?

  • From Bryant
    From Bryant   1 weeks ago

    Have you ever tried just plain tap water into an up to operating temperature engine under load? About 8 oz at the rate of almost stopping the engine then let it clear out and back again several times. Then run for 5 or so mins longer & check results. Cheaper than MMO unless you're in California. 😜

  • George Nelson
    George Nelson   1 weeks ago

    I see more improvement with the Marvel Mystery Oil. Sea Foam, not so much.

  • Chris Bacher
    Chris Bacher   1 weeks ago

    I was surprised. It looked like the MMO did a better job of cleaning than the Sea Foam. What is it in Sea Foam that improves compression?

  • rbeez2004
    rbeez2004   1 weeks ago

    Ill tell you what the real winner of an idea is. Service your car exactly how your owners manual says and you wont need any mystery fluids at all. Thats 23 years of mechanic talking.

  • Timmy Beckman
    Timmy Beckman   1 weeks ago

    I’d like to see this comparison again in 6 or 8 cylinder old dirty motors with high milage

  • Wayne Cook
    Wayne Cook   1 weeks ago

    Very much looks like the old Red-X to me, Not sure is you guys had Red-X in the US or not but was a big thing here in Australia From Aprox 1950's though to about the 1970's, They had Red-X trial runs etc..

  • Flatus Antiquitous
    Flatus Antiquitous   1 weeks ago

    It would be interesting to compare all of these products that supposedly clean the combustion chamber with water injection.

  • Shane Fochtman
    Shane Fochtman   1 weeks ago

    I have a 2005 dodge rumble bee #1870, its a 1500 with a 5.7 hemi it has 198,000 miles on it an sounds like new, runs like new. MMO in every tank since it drove off the lot! Dosen't use or leak oil! You can't go wrong with MMO!

    MITCH OFF THE FENCE   1 weeks ago

    Seafoam can go in your gas as well and crankcase. But growing up mmo was the thang, so now I'm torn.

  • Big AL
    Big AL   1 weeks ago

    Ao cool to watch one of your old videos to see how much your channel has approved and how you've found cool techniques to achieve your tasks much more efficiently

  • James Pogue
    James Pogue   2 weeks ago

    I do not see a lot of difference between seafoam and MMO, considering the cost I would go with MMO.

  • Steve Harmon
    Steve Harmon   2 weeks ago

    I worked for UPS for years and often would see a case of MMO over in the corner in the shop. You have to believe me, if it didn't work the company would not allow it on the property. Do you suppose they did tests on it? They tested their scotch tape to buy the best. Just sayin.

  • Isa Ademi
    Isa Ademi   2 weeks ago

    I watched the video and I thought MMO did better than sea foam.

  • Larry Burns
    Larry Burns   2 weeks ago

    so whats your opinion??I have used MMO for years..My Dad used it..I have always had gr8 results..Your video echos that ..MMO did a better job cleaning the engine...Thanks for the video..

  • Kevin Hong
    Kevin Hong   2 weeks ago

    I use both and I have been successful with mmo freeing a stuck valve on a chevy 350 that had sat for 10 years by drizzling it on with a syringe and tapping the top of the valve with a brass punch until it yielded about 5-6 times of hammering it down and it slowly popping back up. I tried motor oil, penetrating oil, wd40, and nothing worked like the mmo that engine is still running to this day without a hiccup

  • dnick49
    dnick49   2 weeks ago

    I applaud and thank you for a very informative and well presented video. The only thing missing from an otherwise excellent presentation was your opinion on what you thought of the results. You have wonderful common sense and knowledge and I was hoping to hear what opinion you had. Still a great video and I look forward to more of your videos. Thanks and God Bless.

  • Jason Matthews
    Jason Matthews   2 weeks ago

    Don't think anyone else has done it, would be cool to see a carbon treatment on a dirty cylinder from start to finish with a see through cylinder head.

  • Mytwistedvoices
    Mytwistedvoices   2 weeks ago

    For cars, Sea Foam. Marvel is an oil, not good for catalytic converters.

  • Aeronomx
    Aeronomx   2 weeks ago

    Is M.M.O. hard on gaskets? Only reason I use seafoam is because B-12 really did a number on my engine so never again.

  • Michael Miller
    Michael Miller   2 weeks ago

    No question, Marvel Mystery Oil!!!Thank you so much!