Quote:
Originally Posted by Headdamage
If it is gear oil it is as stated above, however I have seen oily 2 stroke buildup in the exhaust of these motors and this can seep out over winter make it look like a leak (it will be black).
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It could be the above. The OMC 2-strokes are notorious for having exhaust build-up seep out quite regularly. If its black or brown this is what it is. If it is light yellow/green its gear case oil then the likely the prop shaft seal. Un-burnt oil/fuel will show-up in the water when using the motor quite regularly. Those old 2-strokes are bullet proof reliable but they are not the cleanest nor efficient operating units that is for certain.
A guy should always change out the gear case oil in the fall before putting the motor away for storage. This ensures no water is in bottom leg to freeze up. When changing gear case oil in bottom leg, always let changed oil sit for a hour to see if any water settles to the top. If water appears, you have a blown seal somewhere than needs to be replaced.