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Marvel Mystery Oil

Discussion in 'V7/V85/V9 Chat & Tech' started by Larry Vance, Jun 23, 2016.

  1. Larry Vance

    Larry Vance Tuned and Synch'ed GT Contributor

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    Has anyone used this as a fuel additive for cleaning the fuel injectors? Met a long time Ducati owner who swears by the stuff.

    Thanks
     
  2. sign216

    sign216 High Miler

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    I've used it on the outside of the engine. Used with aluminum foil, to clean old corrosion.
    As for inside the engine, I like the idea, but intellectually I think it's snake oil.
    Although the idea of adding it just before an oil change to loosen things up seems like a good idea.

    Actually the injectors are easy to remove and send out for a real analysis and cleaning.
     
  3. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    I often see references for MMO on a Model T forum to lubricate valves stems when mixed with fuel. Many there agree it is snake oil, some swear by the stuff. As for injectors, you are better off occasionally adding some sea foam to your fuel, or stick with top tier fuels that have sufficient cleaning agents.
     
  4. Trout

    Trout GT Reference

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    I've seen people dribble it in the carb (mostly on cars & trucks) with the engine running about 2000 rpm to clean the carbon off valves & pistons. One guy would slowly increase the amount he poured in until the engine started to choke then he would splash in a bunch & let the engine die. He'd go off & smoke a Camel, come back get the car started and race the engine until it cleared out & would idle again.
    I used to dump a little in the fuel tank of my old Ambassador thinking it might be a little extra lube, didn't ever hurt it but don't know if it helped.
     
  5. sign216

    sign216 High Miler

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    I go out of my way to get top tier fuels. Not sure if it really matters, as when I pulled my low mileage V7 heads they did not look clean at all.

    I'm thinking about investing in race gas for my bike, although my wallet begs for mercy.
     
  6. sib

    sib Cruisin' Guzzisti

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    I go out of my way to get the cheapest fuel available. I've never had injector problems on my motorcycles (over 21,000 mi) or on my cars (probably over 500,000 mi). I consign Marvel Mystery Oil and its kin to the mytholoogy department, along with magnetic fuel enhancers.
     
    Trout likes this.
  7. Trout

    Trout GT Reference

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    Growing up in a small city of 600 people & being the main "wrench" in the area I got to know people, their cars & their habits.

    Oils? Fuels? Additives? At some point I had the heads off & many times the pans off most of the machinery that lived in the area. Irrigation pumps to hi-perf car & marine engines with tractors & weed wackers thrown in. Never liked the 2-strokes.

    In the 50's until the late 70's fuels & oils may have made a difference, in today's world not so much.
    Octane ratings are probably one of the least understood things out there.
    Hi octane does not make an engine run, faster, better or cleaner but the idea behind it sells a lot of fuel.
     
  8. abbienormal

    abbienormal High Miler GT Famiglia

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    I agree on the high octane to a degree. Past experience on certain vehicles shows a marked difference. I put regular in my 2007 Norge when I had it and then go find the little kid that dropped a bag of marbles in my engine. The knocking was very loud. I have not tried it on my 2012. My Mini Cooper JCW calls for premium and runs ok on regular but the 2 times I tried it I lost 3-5mpg. I have a low compression ratio Honda Pacific Coast. I put regular in it a couple times. It seems to run ok but on start up it is not happy. I have only heard it backfire (I know, afterfire) out the exhaust upon starting when it had the regular in it. I see no reason it should not like regular but it doesn't. I used to not care because what was $0.20-$0.25 a gallon? Now it is between $0.40 and $0.70 a gallon extra and I am not particularly pleased with that.

    As for Marvel Mystery Oil and other such stuff I am not a fan but I was big doubter of all the claims people made of Sea Foam. My Mini was starting rough and sounded like clogged injectors so I dumped in a can. It cleared up and ran fine. So I am somewhat of a convert there. Since it can be used a fuel preservative I have put it in my bikes for the winter,
     
  9. drlapo

    drlapo Tuned and Synch'ed

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    I've used MMO successfully for decades.
    The most dramatic benefit was realized when we added a few ounces to a friend's gold wing because it had noisy lifter.
    It quieted the lifter and it stayed quite
    It's also good as a gun oil as it doesn't gum up
     

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