Or.....start at 180,000 (with a fresh filter)...put on 3800 miles gets you to 183800 and install filter 1 (of 4) at 187600 ...put on another 3800 and install filter 2 (of 4)...that puts you at 191,400...put on another 3800 and put on filter 3 (of 4) and that g... Login to read more.