⚡ NGK Iridium IX Spark Plugs
NGK's Iridium IX plugs use a 0.6mm iridium tip for consistent spark kernel formation across a wide operating temperature range. They are the OEM spark plug for Honda VTEC engines, Toyota 2JZ, Subaru EJ-series, and Mitsubishi 4G63, and are the default replacement plug for Japanese performance vehicles. Their superior durability (60,000 km+ lifespan) and consistent performance make them the benchmark in the Japanese market.
Ignition
Technical Specifications
| Type | Iridium IX fine-wire spark plug |
|---|---|
| Tip Material | Iridium (0.6mm) |
| Ground Electrode | Nickel alloy |
| Heat Range | 5–8 (application dependent) |
| Gap Rec | 1.0–1.1mm (NGK pre-gapped) |
| Thread Size | M14×1.25 (standard) |
| Electrode | Corrugated cut ground electrode |
| Lifespan | 60,000 km minimum |
| Msrp | $8–$15 per plug |