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All the metric plugs like NG and NGK the higher the Number the colder the plug. I use the colder plug D9EA for summer use have not tryed in the colder times of the year but i will try it this winter.
All the metric plugs like NG and NGK the higher the Number the colder the plug. I use the colder plug D9EA for summer use have not tryed in the colder times of the year but i will try it this winter.