The only problem with 10W-50 is you can't buy that weight. The only "50" available is 15W or 20W-50. You could use 10W-40. European cars call for xxW-40 as a mininum. I have yet to see where a xxW-30 oil is called for in an European eng.

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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