I second that. Alot of people fall into the marketing trap of thinking their "expensive" European car needs some exotic plugs like Bosch Platinum, or double platinum, etc. Just use the good old cooper plugs specified by Benz. The Bosch plugs for my '94 coupe were something like $2.40 a piece, if I reember correctly. Ironically it's the plugs in my daughter's "economical" 2000 Toyota Celica that cost alot more. Spec for that car is Iridium plugs which were $8 a piece!!!!

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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