Date registered: Nov 2008
Vehicle: 01 S320 & 99 C240 Sport Wagon
Location: Paris - France
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Replacing plug wires C240 (M112 - V6)
Hello Nushram - This is a very easy project - all you need is a number 25 Torx socket to loosen up the coils and a 17 or 18 mm open ended wrench to pry (carefully!) the plug connectors off. You could probably get it done in less than an hour.
The wires ( there are 12, 2 per cylinder ) themselves run about $120 to $300 depending on the brand (Bosch, Beru, NGK, Champion or Bremi are the most common, but there are othres...) .
Personnaly, I usually stick with a German OEM supplior and I believe that would be Bosch, Bremi or Beru.
There are a couple of well documented DIY articles on changing the spark plugs AND the wires, but if it's just the wires, it's really very fast & simple.
Having said that, I suspect that your MBZ Stealership is quoting $1,200 for replacing both the plugs AND the wires.
Do some searching and I'm sure you'le find the DIY post on replacing spark plugs on the alloy V6 and V8 which is not much different.