All I know is the research that others have done indicates that the "Wal-Mart" and cheapo filters aren't what we should be using. That includes Fram, and those made by Fram, and just generally those you pay $5 or less for. Of course, you can pay more and get less too. For example, the filter evaluator guy (
http://www.knizefamily.net/minimopar...lterstudy.html) disassembled the various NAPA filters and found they were the same inside, but the prices weren't. Filters must be a lucrative business to have the number of scammers in it.
Here are his opinions based on disassembly and evaluation thereof:
http://www.knizefamily.net/minimopar.../opinions.html