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How Much Gear Oil

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  • How Much Gear Oil

    I have a 90 HP 1989 3cyl 2 cycle Mercury outboard.
    I'm pretty sure I was told in here that my engine takes about a quart and a half of gear oil. The guy at West Marine told me the same thing, which is why he sold me two quarts (this was last year). So I just changed the oil for the first time (first time I did it, not first time it was done) and everything went well. Except the oil started pouring out the vent screw after less than one quart. Maybe something like 24oz of oil. I let it sit for a bit, then slowly pumped a little more in, but it came right out. Is everything ok? Did people just get my capacity wrong? Or is there something wrong with my motor?
    [ My Boat ][ My Boat In Action ]
    FS: 2010 Chevy Camaro 2LT - Red - Stick - Low Miles - No-Reserve http://ipsite.org/1l52


  • #2
    Re: How Much Gear Oil

    18oz is how much oil it took, and not a drop more.
    [ My Boat ][ My Boat In Action ]
    FS: 2010 Chevy Camaro 2LT - Red - Stick - Low Miles - No-Reserve http://ipsite.org/1l52

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    • #3
      Re: How Much Gear Oil

      My 30 HP takes about 6 oz. I assume a 90 would take more - but a quart and a half? That is 48 oz. Seems like a lot.

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      • #4
        Re: How Much Gear Oil

        It occurs to me that one of the joys of our system of weights and measures is that its easy to make a mistake when converting units. For example if the person at West was in a hurry and was thinking 12 oz. per quart (I've done it more than once) he'd easily read 18 oz. in the specs and come up with a quart and a half as the amount needed.

        12, 16 and 32 can easily get used in the wrong application if one is in a hurry.

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        • #5
          Re: How Much Gear Oil

          Originally posted by l008com View Post
          18oz is how much oil it took, and not a drop more.
          That sounds about right, now you have enough oil for two more fills.

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          • #6
            Re: How Much Gear Oil

            So I just drained this out of my boat. It's 1 year old. Is that "cloudy" oil, that would imply a seal leak? Or is that just regular dirt streams in the oil?

            [ My Boat ][ My Boat In Action ]
            FS: 2010 Chevy Camaro 2LT - Red - Stick - Low Miles - No-Reserve http://ipsite.org/1l52

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            • #7
              Re: How Much Gear Oil

              Do you have a magnetic drain plug with "fuzz" on it? How long since you used the boat? Maybe some separation of stuff if it's been idle for a while. Pour the oil in a clear container to see of there is water on the bottom.
              Sent using a tin can and a piece of string. A technological breakthrough. The tin can is a 1966 Starcraft Nassau powered by a 1966 Merc 500.

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              • #8
                Re: How Much Gear Oil

                The boat has been sitting all winter. And yes the drain plug does have a magnet on it, i didn't notice very much fuzz on it. I already poured the oil back into the dark container it came from and disposed of it.
                [ My Boat ][ My Boat In Action ]
                FS: 2010 Chevy Camaro 2LT - Red - Stick - Low Miles - No-Reserve http://ipsite.org/1l52

                Comment



                • #9
                  Re: How Much Gear Oil

                  I guess the best you can do now is run it a few times and drain the oil again. Just check for water the next time.
                  Sent using a tin can and a piece of string. A technological breakthrough. The tin can is a 1966 Starcraft Nassau powered by a 1966 Merc 500.

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                  • #10
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                    Re: How Much Gear Oil

                    It will take slightly less than 1 qt. Be sure you let the lower unit drain completely before refilling.

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