Ok, since we are on the subject of oil here.....
I was in a local indy shop today and got in a conversation about oil filters. I mentioned that I like K&N filters. The owner of the shop said that he recommends the HD filter (and he sells both - and others) because it is rated to catch particles as small as 5 microns. He pointed out that the K&N filters do not have any such rating on the box, literature, or the K&N website. Anyone know the rating of the K&N filters... or why K&N does not rate their filters?