here's an excerpt from something i posted a few months ago.
Read the websites, i uised to think fram were good until i started researching them. You'll probably never buy a fram filter again.
Mike
There are several sites out there that review oil filters. I would like to see one that compares actual particle filtering ability, but i haven't found a good one yet.
Here's a good page that covers all three of the filters you are talking about.
http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy-german.html
Here's another one from the same site, but doesn't cover the mahle filter. BUT, it does have pictures of what they all look like inside.
http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy-mopar.html
After reading all that, i'd never buy a fram filter. The build quality is terrible.
Mike