Thread: Spark Plugs: Resistor vs. Non-Resistor
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  #45  
Old 10-09-2014, 08:56 PM
coolram62 coolram62 is offline
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Join Date: Feb 2013
Location: South carolina
Posts: 47
Looking through plug part numbers at Advance for my '88 420 it has a Bosch P/N 7905 listed. It's a Bosch Super Plus Copper Core plug. My question is... is this a non-resistor or resistor plug. The new P/N W8DC would be for the non-resistor. If there's a R ,as in WR, in the Bosch p/n would mean resistor correct?
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1983 300SD
1988 420SEL
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