Mitsubishi 4G18/4G64 4G20D4 473Q Iridium Spark Plug BKR6EIX-11 4272 Powerful Ignition

This replacement uses iridium center electrode and side electrode; compared to OEM nickel alloy plugs, higher hardness and burn-scar resistance; under normal conditions lifespan 80,000-100,000 km. OEM numbers correspond to 4G18-4G64; fits Mitsubishi 4G18, 4G64, 4G20D4 and BYD 473Q engines. Function is to increase ignition energy via iridium tip, ensuring complete combustion, reducing carbon buildup and misfire risk. Replacement difficulty is moderate; use a 16mm spark plug socket; torque 25-30 N·m to avoid over-tightening and cylinder head thread damage.