I Had a Circus worker that drove his 15 CTD with the wif light on all the way from New Mexico to So Cal towing equiptment.Lack of power complaint.Drained the filter and some very nasty fuel.Replaced the filters only cause he needed the truck to work,brought it back the next day to drop the tank.At least an inch of water in the tank-the filters did their job.No apparent damage.Very impressive filters