The seal on my drive shaft had a leak that was only from a certain position so only leaked when the inner and outer spots lined up. It looked like the mess you have there.

I used Oil Eater to clean up then checked for leaks.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course