DPF stands for Diesel Particular Filter and has become a common feature on diesel vehicles. The purpose of a DPF is to capture soot to reduce the exhaust emission output from diesel vehicles. They can become clogged up and sometimes need a regeneration or worse case replacement. Lots of short journeys at low speed increase the likelyhood of DPFs becoming clogged up and can leave you facing a costly repair bill. To help try and avoid this, ensure your diesel vehicle gets regular long runs on major A roads or motorways getting up to a higher speeds (70mph).