Alex, Patman is right. That oil filter study is a few years old. They may have been the same when the study was done, but not any more. Motorcrafts are not Pureones. They have the same shell, the same silicon anti-drainback valve, but the filter element is made of a different material and is not as densly packed. Cut open a Purolater Pureone, a Purolater Premium Plus, and a Motorcraft, you will find the Motorcraft is really more like a Premium Plus. Still a decent filter, Joe