Any one use these? We just got a 05 Ford Explorer for my wife this week and its the first vehicle I've ever owned that Fram made a Tough Guard filter for. I was tempted to try one, but was worried about the oil in the filter holding up. I've seen K&N's before that weren't all that dirty, were sorta dry looking and I was afraid of this happening to the Tough Guard after awhile and its affect on the filters ability to filter out all the dirt/dust. I usually keep my filters in for atleast 30,000miles and wasn't sure if these filters relied on the oil to do most of the filtering. Anyways, I got an Extra Guard for it this time around, but if its still running by then, I might try one of these.