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  1. #1
    Cadet
    Join Date
    Jun 2005
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    SAN DIEGO
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    1

    Default 1978 Mercury 800,direct 4 charge, 80 hp fuel mixture ratio

    My brother-in-law just purchased an old speedboat. It has a 1978 Mercury 800 Direct 4 Charge 80 hp engine and we need to know the oil to fuel ratio. Thank you

  2. #2
    Supreme Mariner
    Join Date
    Mar 2004
    Location
    On Barnegat Bay, NJ
    Posts
    17,593

    Default Re: 1978 Mercury 800,direct 4 charge, 80 hp fuel mixture ratio

    50::1 Gas to TCW Oil. Mix 1 pint(16 oz) of oil with 6 gal of gasoline.

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