I have a 2001.5 and I installed an OilMaster (at the time) bypass filter. It has changed names to become OilGuard and now I see something about ecomicrofilters involved with this unit now days. I originally bought a box of filters and still have 4 or so left. I got to looking into this and the filter model now is EPS-20F for basically the 4 inch tall and diameter filter. The prices of these filters seems to have gone through the roof? Whats up with that these days? However, I am very satisfied over the years with this filter unit and was having blackstone labs testing my oil on many occasions to which I had a report come in from them on a 10,000 mile oil change interval that was very favorable. I run the lubrication engineers LE8800 oil, that I buy from them in the 5 gallon pail and change the bypass filter and my service interval is 10,000 miles. Now days I dont drive it that much, so I go a while and just change it anyway. But what is the story on this bypass filter now days and the price of these filters?