As I understand it the dpf gradually fills with soot which then triggers[under certain conditions] a re-gen where the soot is burnt off[or you can "force"a re-gen]however every time a re-gen is completed it leaves an ash which the re-gen can't burn and the dpf gradually fills with this ash,hence the need to periodically remove the dpf and clean it of this residue.Whether this ash build up would cause oil consumption problems I don't know.
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