service costs for diesel engines

hello, a friend finally wants to buy a volvo. his annual km performance is more than 35 tsd km, which suggests the purchase of a diesel. with the engines he is flexible (from the driv e to the d5 goes everything in order for him). what we asked ourselves was what other costs of the diesel to come to it. how is it to exchange the dpf, regeneration cycles and refilling of adblue / urea through the service (if you can’t do this yourself, or does volvo have such a thing at all?). as engines such come into question from 2010: driv e 1.6 psa, 2.0 psa, and the 5 cylinders since this time. for a new vea the budget unfortunately does not suffice, although I would be personally interested in whether the adblue need or be satisfied with regeneration cycles. thank you flobber