Re: Champion Spark Plugs D16 or 13

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July 18, 2015 at 6:33 pm #20353
jim-moffatt
Participant

    US Member

    I have used D16s with success to replace C7s, 13s, M5s and M6s. In New Hampshire spring/fall waters the D9 is too cold to replace M5s in most pre war motors.