You will not find any European car that recomends xxW-30. From what I have seen and read ALL European cars take xxW-40 or higher. For conventional oil I would use 10W-40 or 15W-40. For synthetic 15W-50.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section