If your car is one of those FSS cars, then you should be using full synthetic. Regardless of which oil you use, it should be nothing less than xxW-40.
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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
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