Ugh. I'm having exactly the same oil consumption woes with my '07 185. Not had the soot filter full issue yet but I'm sure its coming. I notice my fuel consumption going up and down a lot now so I'm sure the car is trying to regenerate the filter quite frequently. Mostly after a motorway run the fuel consumption improves dramatically and after a couple of weeks of A and B roads it drops again.
I would say take it for a long blast (make sure it has enough oil!) as a first attempt to sort the filter.
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