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Denso Spark Plug Numbering System
Wondering what the numbers and letters on a Denso spark plug mean? These Denso spark plug charts explain how Denso's numbering system works.
View full size version of Denso spark plug numbering chart.
View full size version of Denso iridium spark plug numbering chart.
View full size version of Denso iridium spark plug numbering chart.
