The car has an SCR regenerating DPF that requires regular doses of AdBlue (separate filler under the filler flap). I've yet to hear of problems with an AdBlue DPF as long as the DPF is properly replenished. It tends to last about 6000 miles and a refill costs about £30. It is widely available at fuel stations because HGVs have been using it for a long time. Follow the instructions and be careful not to splash any on the paint or on yourself.