For your car, neither.

The "platinum" plugs you envision are KMart specials sold only in the USA.

Some later Mercedes feature Platinum plugs as OE, but they are nothing like the USA specials.

Use the Bosch plugs recommended for your car.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles