Not endorsing anyone or anything. This is an interesting study though. Link>

http://people.msoe.edu/~yoderw/oilfi...lterstudy.html

Since I can spare a little extra change, I personaly run Mobil 1 synthetic oil and filter on all my ground based vehicles. Been doing this even before I read this article. I sometimes run the delco duraguard if it's at super special price.

I also only change my oil once per season,(except my truck), since miles is not an issue for me.

This subject has probably been beat before but so the hell what. It's slow 'round here.