DPF Regens Disappear!! October 21, 2020 Recently a new customer who purchased TDR-FL® (Summer) diesel fuel additive reported to us about a significant change in DPF regens on their 150+ unit fleet. The rate of active regeneration dropped from averaging every 2 days per unit to ZERO (0)!!!! That is incredible considering the stop and go nature of their drivers daily routines. Fuel economy improvement, reduced maintenance expenditures, increased life-span of your diesel vehicles. Ask us how we can do the same for you today! Back To News and Comments