If you run Bio at all, it will clean as it goes and filter maintenance is within norms. I drive for a company that has a fleet of about 70 trucks and when they switched to B20, filters were clogging in short order. I assure you, we don't drive in dusty conditions (PacNWest) and we aren't in the habit of adding dirt to the tank when we fill up. :-laf Diesel fuel happens to leave small deposits over time, and when the Bio enters the system it scrubs the hell out of it and everything gets trapped in the filter. What happened is that we had never run Bio before, and it clogged the filters.