I wonder about the grommet. The ME folks comment about the air velocity being pulled by the PCV inlet, and although that small slot helps a lot with oil splash, I have to believe that the air velocity thru that slot is pretty high. The slot may help strip the oil from the air stream????
On my car, I added 1/4" spacers between the baffle and valve cover. I haven't driven the car enough yet, but my initial check for accumulation at the vapor separator did not show anything.
