http://people.msoe.edu/~yoderw/oilfi...lterstudy.html
Lots of info above.
The only way oil can can get by without passing through the element is through the bypass valve.When the element is clogged,or oil is too cold,it will go around the element.
I use an O'Berg filter personally.It has a cleanable element and ball check bypass.There are several different micron ratings on the screens depending on the flow and oil visc. used.Holley bought the rights and makes it now.
The System One is pretty similar to the billet one Steve has,but not as purty
