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    1981 OMC 400 140 water in oil

    Hello I have a 1981 Oliver boat with a 400 OMC 140hp 2.5L. I am a automotive mechanic I know nothing about boats. This is my first boat that was my grandfathers. So i want to change the oil in upper gear case first i pulled the fill plug and just gushed out with milky oil. Drained, flushed...
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