I saw a cutaway years ago with different oil filters and it was eye opening I used to use fram filters but I won't touch them now especially the air filters that come apart. Motorcraft oil filters were very well made and they are inexpensive. I am sure you could find great quality with the more expensive filters but as far as oil these motors were developed using motorcraft filters and the media alone can dictate the flow rate and personally I am more comfortable using oem when it comes to oil filters. I also have a 6.0 powerstroke and as far as fuel filters I only use motorcraft and racor which is the same. There have been a lot of 6 liters screwed up because of faulty aftermarket fuel filters. Just my 2 cents.