Re: oil from the prop
Smell the oil. If it is black gungy and smells burnt or of gasoline or exhaust fumes it is almost ceratinly just partly burnt oil from the fuel as said already.
If it has the unmistakable smell of gear oil then that is probably what its is and you should be checking the gear case for water ingress ... but you changed the oil as part of the servicing before you put it away for the winter .. didn't you,
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If you had made a decent job of fogging the engine before you stored it for the winter there would be more than "a spot". I always stand mine over an old baking tin from the kitchen so as not to make a mess on the floor.