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.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member