I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?