Alright, here's a AMSOIL dealer perspective. While AMSOIL carries WIX and Donaldson Endurance oil filters, AMSOIL states that the WIX filters they offer are fine for people NOT looking for highly extended drain intervals. For example, AMSOIL says that when using their XL 7,500 mile engine oil, the WIX filters are fine. They are a quality filter. BUT, AMSOIL also goes on to say that when using their 25,000 mile oils, the Ea oil filters are recommended over the WIX ones. In our CTD application, the AMSOIL EaO80 and Donaldson Endurance Nanofiber ELF7349 are identical filters. The AMSOIL one is just labeled differently. So, this would support the opinion that while WIX filters are quality filters (I've run them on my wife's Passat for years with great results), the Ea or Donaldson Endurance filters are better for HD or extended applications. When I have a diesel customer ask me for an oil filter, I always sell them the Donaldson Endurance filter, and not the WIX. Nothing against WIX, but there are sometimes better filters available for some applications. I consider the WIX filter to be of equal quality and filtering/holding ability to a Fleetguard standard filter. They are both cellulose filters. The Donaldson Endurance Nanofiber is, IMO, equal to or better than the Fleetguard Stratopore. Only two types of oil filters have ever touched my truck. Fleetguard Stratopore and Donaldson Endurance. I currently have been running the Donaldsons for 2 years and am very pleased with them. But, in all fairness, both Stratopore and Endurance and top quality filters for our needs.
Not doing this to advertise at all, just giving another perspective.