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Dale
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    cron as others have stated these 10hp OMC motors use the small gear case from the 5-1/2  7-1/2 motors. Understand that these motors need special attention.  The gear case oil needs to be changed often and keeping water out can be a challenge.   If you live in an area that freezes, drain the oil out at the end of the season.  Fill it with good clean 90weight.  The fill/vent plugs need gaskets.

    dale