Not sure if it's oil or what. Ran my new-to-me '82 9.9 Johnson for the first time today. Parked the motor on a stand a few hours ago and just went out to check prop size and there is a small puddle of black ooze under the prop. What's up with that? I doesn't look like it's leaking from the lower unit fill or drain hole. What could it be, where could it be coming from, and do I need to panic yet?