I have a 92/Force 120hp, after I decarbed I noticed I would have what it looks like really dark oil running down the skeg, just enough to run from the bottom of the prop to the bottom of the skeg, it's just a thin line like if you oversprayed paint and it ran about 3 inches and as wide as a pencil. I took off the prop and cleaned the O-ring and put the engine back down, came back 3 days later and there wasn't any drips or runs downs, after I took it back out it did the same thing, anybody got any ideas? I'm going to change the L/U Lube just to double check, Any