The Volvo spec oil is hard to come by at reasonable prices but MB 229.71 is hitting the same or similar targets and is found on more products. If it were my volvo I would look for this spec if I wanted to run xW-20 weight.
Also, if you wanted to run a xW-30 weight, there are several oils at walmart that meet the requirements of both A5/B5 and Dexos1 Gen3, which, combined, is very close to the aftertreatment compatibility and TBN concerns of the Volvo VCC spec, but in a 30 weight. I would comfortably do that as well. Just offering this up for consideration, as I wouldn't personally want to be feeding a qt/500 miles of hard to find expensive oil into one of these. You can find these alternatives at walmart for around $5/qt.