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16-valve spark plugs
I have an '85 190E-16, and I've been running Bosch H9DC plugs, rather than the H5DC or H6DC. I'm not a real aggressive driver, and so perhaps these hotter plugs I've been using are more appropriate for my car. Is there much of a difference? What changes might I see if I went with the H6DC? Thanks very much. Randy
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