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My rear engine leaks oil and leaves a mess just like in your picture. The discoloration (grey) is from the engine cowling rubbing together. Let it get wet enough with oil, and it will be more black over time..........know this from experience. I have looked all over the place on my engine and it is in the shop now getting the push rod tubes resealed as well as the oil cooler gasket replaced. My engine is totally dry on top, with oil dripping from the push rod tubes. Plane sat for a while and the seals dried up. Mechanic showed me one and it literally has cracks on it. Zoom in on the attached picture.....same oil issue.
Since my plane is solid orange, it is not as noticeable, but still embarrassing.....Leaves a puddle of oil like my VW Beetle does, but I don't want to use the same saying "the only time is stops leaking is when its out of oil".
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