Just went to the Mobil 1 website and they now list 0W-40 as an available weight. It states it meets the strict A3 ACEA European rating and is approved by VW/Audi, BMW, Saab, Porsche and Volvo. Oddly, Mercedes was not listed. I don't know if it's a matter of getting permission to list their name. I don't use Mobil 1 right now. My Benz gets Delo 400 15W-40 and my Passat gets Valvoline Synpower 5W-40. This oil also meets the ACEA A3 rating and is approved for "BMW High performance Synthetic oil requirements; VW 500, 502, 505, Mercedes 229.1, all Rolls Royce/Bentley cars and all Porsche performance requirements.

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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