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Well, not really..Bosch has Stopped making the non-resistor copper core plugs that older (pre mid 90's) Mercedes require. Instead of a W9DC (or DC0) they are now WR9DC etc.. I've already pulled 3 sets of these plugs from cars not running properly after a a few hundred miles. One 450SL and two 560's.
At this point I run the NGK BP6 or BP5 ES's for the V8's depending on what shape the valve guides etc are in.
Jonathan
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