The rear engine is hard....the way the air swirls around makes it difficult to figure things out. I have been chasing it, and while I have reduced it, I have not been able to totally stop it, so I gave up. I replaced just about every gasket that can be replaced without splitting the engine. I even followed some advice from the Mooney 231 group. Still leaks and leaves black smears coming out of the bottom of the cowl flaps and the cowl to fuselage joint. The aluminum rubbing together makes even new oil look like crap seeping out the cowl joints.
The color of my plane makes the oil only slightly less visible than a white one, but still there. And it only takes a few drips to make it look terrible back there.
Like I said, I gave up and just carry a spray bottle of degreaser and paper towels and clean it up when I land. I just tell people its like a radial engine.....the only time it doesn't leak is when its out of oil 🤣
Best of luck!
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