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Oil Pan Plug Size? - 1999 5.7 GM

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  • Oil Pan Plug Size? - 1999 5.7 GM

    I am going to get one of those quick oil drain hose kits and was wondering what size my drain plug is.....1/2-20, 12mm or 14mm?
    1999 Sea Pro 235WA w/ 5.7L Mercruiser Alpha Gen II
    1974 Lucraft 13 w/ 1997 30hp Mariner

  • #2
    Re: Oil Pan Plug Size? - 1999 5.7 GM

    Your 1999 5.7L oil pan is metric......

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    • #3
      Re: Oil Pan Plug Size? - 1999 5.7 GM

      why not just suck it out of the dipstick like 99% of marine engines are designed to do ?
      most,not all, late model GM pans are 14MM, that being said the only way to know for sure is to remove yours and measure the thread diameter and pitch.
      no tech questions by PM, they wont get answered.
      you have to be trusted by the people that you lie to .

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      • #4
        Re: Oil Pan Plug Size? - 1999 5.7 GM

        I have been using the dipstick method but I just don't like the fact that I can't get all of the old oil out. It doesn't matter now anyway, I was thinking I may have enough room around the engine to get down there and install one, but found out I don't have as much room as I thought. I guess I will just stick with the dipstick method....
        1999 Sea Pro 235WA w/ 5.7L Mercruiser Alpha Gen II
        1974 Lucraft 13 w/ 1997 30hp Mariner

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        • #5
          Sign up today
          Re: Oil Pan Plug Size? - 1999 5.7 GM

          I have been using the dipstick method but I just don't like the fact that I can't get all of the old oil out.
          I don't know what you have there, Mercruiser or Volvo, but both of those have the dipstick attached to the bottom of the pan, so you will be getting as much oil out with the dipstick as if you pulled the plug on the bottom of the pan. Besides, those hoses that go out the drainplug hole are worthless. They are slow, even with warm oil, and will take a day to drain.
          Don S.


          Please, no PM's (Private Messages) regarding boat/engine problems.
          That is what the forums are for.
          Only forum/moderator issues will be answered in PM's.

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