For what it's worth, my understanding is that it's normal for this generation of Volvo engine to use some oil. My 3Ltr 24v 960 has 155,000 miles on the clock and it has consistently used around half a litre of oil (1 pint) every 1,500 miles since it was new. Because the oil consumption hasn't actually increased I'm still using the same 0w-40 fully-synthetic oil that I always have and (touch wood) all seems fine. Just because an engine has a few miles on it doesn't mean that it needs thicker oil - I would only consider using thicker oil if it started using significantly more oil than previously.
Stan.
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