It's not a tappet cover.
It's not the breather cover or from the squiggly o-ring gasket of the cover itself.
It's not from one of the 6 m6 bolts that require copper washers for oil sealing.
I thought it HAD to be from one of these sources as there are no other sources.
Right?
... uh no.
There was a MICRO-crack - invisible to the naked eye, about an inch anterior to one of the aforementioned m6 bolts. More oil at higher revs, of course. JBweld here I come.
