It has been about 40 years since the recommended plug was a D15Y instead of the D16. The heat range is one step colder but the extended tip more than makes up the difference. With the leaded gasoline being phased out the recommended plug for most duty became the D18Y with the D15Y still recommended for heavy loaded engines or the D21 if used with light load use only.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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