I had a 2008 S40 D5 some years ago and did a similar commute to work mostly on country roads and urban dual carriageways and never had any DPF issues. I always used Shell V Power diesel which I think helped to keep the engine cleaner. From memory the DPF software update was done by the main dealer around 2010 and they put a sticker under the bonnet about the oil level so I imagine it is likely the update was done on your car, I guess you could check with the Volvo dealer who serviced the car at that time?
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