Through the International Standards Organization (ISO), automobile-manufacturing countries such as the U.S., Japan, Germany and Italy established certain standards in the manufacturing process of automobiles and spare parts, including spark plugs.

DENSO’s K, KJ and PF (the first and second letter of the part number) spark plugs meet the ISO standard.

Iridium Power®
Original U-Groove
Double Platinum
Platinum TT®
Iridium Long Life
Iridium Racing®

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