They have superseeded, been on restriction, re-designed, you name it. It all is due to people not seating the filter all the way on the "stick." When it's not seated right, there is a possibility of it coming apart, and destroying the engine. Apparently it happened a couple years ago, and even the dealers couldn't get the oil filter. This is why now when you do an oil change it comes with a drawing of how to seat the oil filter.