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DENSO spark plugs feature a class leading wide operating range and therefore there is no need to change the spark plug to a different type. However, DENSO has a small series of semi surface spark plugs available that are better resistant against carbon fouling. This is the …-S series. This could be a good plug for older engines that often drive in city traffic in areas with low ambient temperatures. These semi surface technology spark plugs are used as an option by Mitsubishi and Daihatsu in Japan for the cold northern regions. |