Resistor spark plugs can NOT be used in many MB engine applications..
Follow Mercedes Benz specification on what spark plug to use.
What spark plug is in your engine at this moment, please remove one to check the number personally, if it has an "R" = resistor.
Do not trust service records on this.
Bad wires, cap, rotor and/or wrong spark plugs can wreck your ignition module, most applications this = $2,000.00 - $3,000.00 for a new one.
If you know your MB part number, here are links to verified Bosch Non Resistor Spark Plugs
Bosch Non Resistor Spark Plugs
Call or e-mail your VIN# to check application.
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