Was checking on mid-pipe bolts from the headers I put on last winter and saw this. Was clean as a whistle when I put it away and I've only driven it twice since pulling her back out. Guessing it's a rear main but thought I'd see if anyone else thought any different (pic's not the greatest but the stain goes back to just beyond the TC peep hole cover). No spots on the floor and the level on the dipstick is fine.
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