Modern Diesels have come a long way since the tractor days of gone by. They are now efficient, Quiet and perform very well. There are a few things that need to be aware of when owning a diesel BMW or MINI. Diesels have a big filter on the exhaust to catch all the black soot that we used to see come out of the exhaust. This had to be done for them to meet Emission standards in Europe. Great idea but what they don't tell you is that the DPF (Diesel Particulate Filter) has to be