Yeah, the new plugs could have pushed an already worn out cap/rotor over the edge. Not that it's the plugs fault, just the fact that there is a decent plug there where before there wasn't. Can't say I've seen this on an MB, but I've seen it on many other cars...... I don't have much experience with MBs.....

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition