I just picked up an '87 300E which I suspect could benefit from a new set of plugs. from these posts I get the opinion that NGK would be a better choice than Bosch. My experience with my 3000GT was that NGK coppers would last much longer and retain their performance characteristics far longer than Bosch. Does anyone have a recommendation for the 300 as to copper core, platinum or iridium?

Only use a copper core non-resistor plug.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".