As the car gets older, I find myself more interested in this sort of information. This is one of the most comprehensive studies I've seen thus far. Thought I'd share. Forgive me if this is a repost. Make sure you take a look at the "Oil filter Overview" as well. I found it to be quite interesting.

http://minimopar.knizefamily.net/oilfilterstudy.html

 

Repost from the fluids/lubricant sectio