All diesel consumer trucks since 2007 have DPF systems. Your fuel filter is not a Diesel Particulate Filter. That said, the DPF should not have clogged up if it was going through regen cycles. If it is not going through regen cycles, there is another problem that the Dealer failed to diagnose. That said, There are copiers that can clean your DPF, thus eliminating the need for replacement. However, if the truck is still not cycling through regen, it will clog up again.