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 Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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