NGK reference : IMR9A-9H
NGK IRIDIUM spark plugs have an Iridium point on the central electrode and a Platinum ground electrode. This is the most developed technology that take advantages from the high wearing and melting resistance of the Iridium. The Iridium NGK Spark plugs have a lifetime barely two times longer than standard spark plugs. Do not mix with NGK IRIDIUM IX.
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