[rheavn]

Been watching my Filterminder and it was at 20. At 25 it calls for a filter change. I've always changed my air filters at 30,000 miles as these diesels kick up a lot of dust. I have also heard of some air filters degrading and breaking up & parts going through the turbo. I was anxious to do an autopsy on my air filter after 30,000 miles. The inlet side of the filter was very dirty. The outlet side was clean. Using a light I could see no light through the filter. I saw no degrading of the paper element which was a positive. It is my opinion that 30,000 miles is about right for changing the air filter.