I know many of you have your different opinions about what spark plugs you use, from ngk to beru to champion to bosch. I just want to know if it is ok to use the bosch resistor plugs (HR9DC) or the iridium-platinum plugs, or do I have to continue on with the H9DC plugs that are no longer made, but the dealership can still get them.

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1990 190E 3.0L