In 2017, Ford continued to utilize the 6.7 Powerstroke diesel in the Super Duty F-series lineup. The 6.7 is also equipped in the 2017, 2018 & 2019 models. The 17-19 6.7 Powerstroke was required to meet yet stricter emission regulations mandated by the EPA. To stay in compliance the following emission controls are in place: Exhaust gas recirculation (EGR) system. Soot and sludge eventually build up here and require cleaning. Diesel oxidation catalyst (DOC). The DOC is a ceramic catalytic converter designed to oxidize hydrocarbons in the exhaust stream. This sounds good on paper but eventually gets plugged with soot. Selective catalyst reduction (SCR). The SCR is where diesel exhaust fluid (DEF) is injected & mixed into the exhaust stream. This requires adding DEF fluid to ensure proper operation. Diesel particulate filter (DPF). The DPF captures diesel particulate matter (soot) and uses active regeneration technology to heat the exhaust system periodically, completely burning soot build up & cleaning the filter. All of these things work fine on brand new truck with low mileage. But after a while problems start creeping up. If all this sounds like a potential headache, your right. Delete the DPF and save yourself future trouble down the road.