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OK, think I've got it figured, help me through this.
The crud on the fan-facing side of the tensioner is grease from the bearings inside the tensioner. When I turn the tensioner around, I definitely feel choppiness, like the bearings are worn.
On the other side of the tensioner, there isn't much grease, but it looks like the interface between the washer and the tensioner is where it was leaking (oddly, not the washer - block interface - this is totally clean).
The underside of the tensioner is pretty grimy, and all of the mess is below the tensioner.
So: The tensioner bolt was where the oil leak was coming from. This seems consistent with the below-car leak pattern too, because the tensioner bolt is more centrally located, compared with the vacuum pump.
My only question is: Is the gradual failure of the tensioner bearings related to the oil leak, or just a consequence?
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