The recommendations of Volvo are based moreso on emissions and economy rather than engine protection. Many aftermarket suppliers of oil simply follow OEM recommendations, which can lead to oil being recommended for the wrong reasons. At 180k, I'd say with absolute certainty that the wear on the engine is such that it would be madness to use a thin oil such as 0W/30. The ACEA spec is great for fuel economy and emissions, but in terms of actual engine protection and preservation it's just not up to the job.
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1996 850 T5 - Sold
2003 S40 1.9d - Sold
2004 S60 D5
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