Is marvel mystery oil added to the gas tank of a car or the oil tank of a car?

Which one?

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  • JJ
    Lv 7
    1 month ago
    Favorite Answer

    ADDED TO FUEL: At every fill-up add 4 ounces of Marvel Mystery Oil to every 10 gallons of gas or diesel. An average passenger car tank is 15 gallons, so you would add 6 ounces at every fill-up. Regular use can lead to improved fuel economy.

  • Anonymous
    19 hours ago

    Put some in all the holes.

  • 1 month ago

    Either. Depends on where in the engine you need it. 

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