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Originally Posted by meltedpanda
Glad to hear things are working out, I use the NGK BP6ES, and have no problems. My wires are the old style. Not sure about the resistor wire idea, but you points are logical. Did you measure the resistance of an old wire VS a new one? That may help to see if in fact there is a big difference
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Yes, I did check the resistances. The old original wires with the internal resistor measured 8 kohms. The new wires measured 1.6 kohms (Bosch Premium opti-layer mag, part 09027). Old plugs were W7DC and had low resistance - about 5 ohms. New plugs are in car, so were not measured, but I guess should be in 5-10 kohm range, so total resistance should be about same. Resistor plugs with old wires would probably have too high a resistance. I read somewhere it should not be over 15 kohms.
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My original manual had Bosch W175T30 for the plug ( we have the same car)
these are what it crosses with
W175T30 NGKBP6ES Champion N12Y, UN12Y,
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Yes, my manual says Bosch W 175 T 30 or Beru D 175/14/3 A or Champion UN 12 Y.
But, I wonder if they would recommend same plugs today given changes in fuel and condition of these aging engines!
And especially if the wires have a lower resistance, as do the aftermarket Bosch wires I just bought!