Quote:
Originally Posted by manny
sbourg
You explained it pretty well.
Waybomb
FWIW, my 2000 C 230 K had Bosch F7 KT RC sparkplugs OEM.
Notice the " R ", it's a resistor plug.
Life just ain't that simple anymore. 
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All I was saying is use the correct plugs for your car. If your car's service manual indicates the use of a F7KTRC plug, then use that plug. Don't try to make it "better".