Do you leave your gas line connected all the time? This could easily be gas/oil mixture draining with the gas evaporated leaving a gummy oil residue coming from exhaust port of lower unit. Smell it to see if there is a gas odor to it...if so not much to worry about.
Lower unit oil has the visocity of cane syrup and the color of wiskey with a rancid smell. If it flows like syrup and has the look of coffee milk then you have a leaking water seal in the lower unit. Hope it is just a simple issue....
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