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Marvel Mystery Oil

PT20J

By PT20J
in General Mooney Talk

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Marvel Mystery Oil  

34 members have voted

  1. 1. What has your experience been with Marvel Mystery Oil

    • I've used it occasionally to successfully improve compression.
      0
    • I've used it occasionally to successfully cure valve sticking.
      4
    • I've used it occasionally to solve a problem with my engine and there was no improvement.
      3
    • I use it consistently and have never had any valve sticking problems.
      5
    • I use it consistently and I still had a stuck valve.
      0
    • I never use the stuff.
      22

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201Steve Veteran

201Steve

Posted
Posted
On 8/31/2025 at 1:32 PM, PT20J said:

Probably a good degreaser and starting fluid, but I wouldn’t expect it to have an effect carbon or lead deposits.

I don’t know much about chemical interactions but carbon breakdown is its primary use and design. 

PT20J Grand Master

PT20J

Posted
  • Author
Posted
10 minutes ago, 201Steve said:

I don’t know much about chemical interactions but carbon breakdown is its primary use and design. 

Well, at least that’s the claim :P

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