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I've used Archoil 6400D-Max and my cautious/cynical ear told me that it made a useful difference in smoothness as the engine consumed the treated tank of fuel.
That said, a DPF usually just needs a decent run/thrash where the engine and DPF can get up to full temperature and has enough time for a full regen.
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Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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