Andy,
Try this link:
http://www.amsoil.com/products/sdf.html
I have used Mobil 1 filters and I am now going to use Purolator Pure 1 filters. Why? Heck of a lot cheaper to use the Purolator Pure 1. In the link, you will see that the filtering efficiency of a Mobil 1 and Purolator Pure 1 are the SAME. However, in Pittsburgh, the Mobil 1 filter is $12.00 ! The Purolator Pure 1 (PL 20195) is $5.50.
My two cents,
Scott