MB dealer was the only place I can find the non resistor Bosch spark plugs for my 2.3-16v. Expensive but worth it. Even Phil ordered them for me from MB.

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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