AND after seeing the inside of the plenum from a motor with 63K miles on it, I would say that I dont want my new motor huffing oil through the throttle bodies. Why the hell do manufacturers do such a crappy job of trying to ventilate the bottom end and keep oil in. Seems to me that the current method introduces waaaay to much oil back into the engine. There would be no need to clean throttle bodies if everyone had a catch can.