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  1. #1
    My Boats:
    2000 Donzi ZF W/ Twin 250s
    Join Date
    Sep 2002
    hope, RI

    Add oil in gas? or no.....

    I recently bought a 30' Donzi ZF w/ twin Mercury 250 EFIs. The engines are oil injected but I was told to add some oil to the gas anyway to keep the injectors lubricated. Is this true should I add a quart when i fill up?

  2. #2

    I wouldn't. If your engines are stock, too much oil could actually build up as carbon deposits in the combustion chambers, sometimes called "coking".

    THis is because oil burns hotter than the fuel, so if you run it rich on oil, it could "coke" up, and that's not good.

    Mercury Marine spent gozillions designing those motors/injectors. While no company or design is perfect, if they don't tell you to add extra oil, don't.

    My $.02

    Good luck with your Donzi!

  3. #3
    Join Date
    Mar 2001
    Rhode Island

    What are you nuts?

    Besides the carbon buildup, you will be replacing plugs more often than normal.

  4. #4
    Join Date
    May 2003
    phila pa
    ive heard that you should add oil to the gas for the first fillup to help with the engine break in


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