SNIP "But is there any first-hand, real-life experience to back this up? I mean, is there actually gunk that gets past a 10-micron primary and clogs a 2-micron secondary" I wouldn't have a 2 micron as a final filter since at that size one is dealing with such very very microscopic matter it isn't going to affect your engine. Mine happen to be 10/8--so no problem. What is this obsession with 2 microns? Ron Barr Lady Brookhaven Hatteras LRC 42