Right now, a company called Champion Labs makes them (not connected to Champion spark plugs). However, this could change in the future.
Champion Labs makes 2 different filter designs:
E-core, which is lower quality than their previous designs,
(sold as Wal-Mart Supertech filters, new AC Delco, Car and Driver, Champ, Deutsch, STP)
Performance, which is a good filter design:
(sold as K&N, Mobil 1)
The best oil filters that are still easy to find and affordable are:
Wix (also sold as Carquest, NAPA gold)
Purolator (also sold as Bosch, Motorcraft, Powerflo, Proline)
WIX makes all of NAPA's oil filters
Champion Filters (not connected with Champion Spark Plugs)
Ashland makes the oil to Kubota spec
Champion
Purolator
hastings
I have been searching on the net and found out that WIX makes the carquest oil filters. If you look at the carquest oil filter box it will say Wix Filtration.
Champion Labs.
Champion
Made by Fram.
Firestone makes their own tires. Firestone is a subsidiary of Bridgestone Tire Company.
FRAM makes garbage oil filters, I cut one open and the inside was cardboard. I will only use pennzoil oil filters because It keeps the oil clean and they are very strong filters. The WIX filters are the best in my opinion.