• An iridium spark plug with excellent durability and firing performance has been adopted.

• The extremely thin, center electrode has a diameter of 0.6 mm {0.02 in} and is made of iridium alloy.

• Durability has been improved by the use of a platinum-tipped grounding electrode.

• Based on the thinner electrode (center electrode), electric discharge has been reduced and ignition has been improved, resulting in stable ignition performance under all driving conditions.

• With the adoption of iridium-platinum alloy on the center electrode, a platinum alloy layer is formed which provides high resistance to the development of oxidation on the electrode surface, and in turn deters the development of oxidation of the iridium.