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  1. #1
    tbcaddy18 is offline Cadillac Owners Fanatic Cadillac(s) I Drive: 1986 FWB 307

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    Marvel Mystery Oil?

    Hey all,

    Just curious to see if anyone recommends or has used marvels mystery oil in their FWB and what you think of it?

    Best,
    Tabz

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  3. #2
    My_favorite_Brougham's Avatar
    My_favorite_Brougham is offline Cadillac Owners Connoisseur Cadillac(s) I Drive: 1989 Cadillac Brougham d'Elegance

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    Re: Marvel Mystery Oil?

    My uncle who has been a Cadillac fan since the late 60s swears up and down by this stuff. It's good for the gas, and for the oil too. I like to dump a bottle in some time before I change the oil. It helps get some of sludge out.

  4. #3
    77CDV's Avatar
    77CDV is offline Cadillac Owners Connoisseur Cadillac(s) I Drive: 77 CDV, 01 ETC, 06 DTS III, 69 FWB

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    Re: Marvel Mystery Oil?

    I add a bit of MMO to the gas when I fill up my '69. Helps compensate for all the ethanol and prevents vapor lock.

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  6. #4
    caddy1983 is offline Cadillac Owners Member Cadillac(s) I Drive: 1983 Fleetwood brougham 2 door

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    Oct 2009
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    Re: Marvel Mystery Oil?

    I used MMO all the time. Keeps my fuel and oil clean. I highly recommend this stuff.

  7. #5
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master Cadillac(s) I Drive: 94 Fleetwood Brougham

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    Re: Marvel Mystery Oil?

    Once in a blue moon I will use it, after a thousand or so miles the oil looks pretty nasty, not sure from cleaning or from the MMO sludging, being I am using synthetic it isn't.

    1-2K before oil change probably isn't a bad idea....

  8. #6
    Cadillac Giovanni's Avatar
    Cadillac Giovanni is offline Cadillac Owners Enthusiast Cadillac(s) I Drive: 1989 Cadillac Fleetwood Brougham d'Elegance

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    May 2006
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    570

    Re: Marvel Mystery Oil?

    I use LucasOil stabilizer with every oil change, and I like it. The engine sounds smoother on cold starts, and it really slows the leaky base pan I have.

  9. #7
    tbcaddy18 is offline Cadillac Owners Fanatic Cadillac(s) I Drive: 1986 FWB 307

    Join Date
    Apr 2007
    Location
    Southern California
    Age
    22
    Posts
    193

    Re: Marvel Mystery Oil?

    So would you guys recommend dumping one full bottle in the gas tank every some thousand miles?..and another full bottle in the oil crankcase before an oil change?

    -Tabz



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