Thanks for the gap info. I also am finding that the OEM plug number can be different. I have found H6DC , H7DC, and H8DC all listed as the proper spark plug. The owners manual shows 6 as being the correct heat range, the MB EPC parts catalog shows 8 as the correct heat range on the plug. Haynes shows 7.
Anyone care to tell me what might be their best choice for my 2.3 16v? I was using H6DC, and now I have a set of H8DC on the way.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red