Is this oil on my intake and where does it come from?

TrailBeast said
Look how wet it is right in that corner right above the hole.
It would just stop there suddenly without puddling in that corner and that little hole wouldn't have that much puddled at all if it came from the bolt, so that was my reasoning on that.
Of course do the bolt threads, but the cover is obviously leaking also.
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It's quite possible we are both right. You are 100% correct its moist there, I just would have expected it to leave at least some residue, unless of course its just burning off. I just know I had a pretty substantial amount build up when I uh.. forgot to teflon my bolts lol