1 Answer:
  • nick taylor
    Double Platinum

    Double-platinum spark plugs provide even more performance, efficiency, and longevity than single-plated platinum plugs. What's more, double-platinum plugs are still typically cheaper than iridium spark plugs.    26 Jan 2022
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  • Why do spark plugs turn black?

    Carbon fouled

    Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long.
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