Topic: Marvel Mystery Oil


sarahcecelia    -- 12-21-2021 @ 5:08 AM
  I've always believed in adding about 1/4 cup? of Marvel Mystery Oil, at an oil change, to the new oil. Would adding some to the gas tank too have any advantage?


1931 Flamingo    -- 12-21-2021 @ 6:49 AM
  Lot's of people on the Ford Barn Model A site swear by it. I used to go: glug glug glug glug with it. Still do in my 40.
Some substitute ATF (cheaper).
Remember the old style top oilers??
Paul in CT Not going to hurt anything.


JayChicago    -- 12-21-2021 @ 9:16 AM
  My car came to me with a persistent intermittent miss which I now know was due to sticky valve(s). Common problem with flatheads that sit unused for long periods. Added MMO to the oil, no change; as expected, snake oil wasn’t going to fix anything. Finally added MMO to the gasoline. The persistent miss disappeared with the first drive! Now I am a born-again believer. I add MMO to the gas at every fill up.

This message was edited by JayChicago on 12-21-21 @ 9:51 AM


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