It is a good idea to replace the cap and rotor when they look bad from the inside. Mercedes wires are solid core and RARLEY need to be replaced. The only thing that goes bad usually is the resistor tips and they can be screwed off and on. I have only seen 4 or 5 Mercedes that truly needed wires unless they had been eaten at by rodents.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
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