iridium spark plugs

⚡ Best Spark Plugs 2026 — Quick Answer NGK Iridium IX (IFR6G-11) — Best overall for daily drivers: 100k-mile life, low voltage draw, fits 80% of 4-cylinder engines. Denso Iridium TT (IK20TT) — Best for turbocharged engines: twin-tip design resists fouling under high boost. Bosch Platinum+4 (4417) — Best for older V8s: 4 ground straps … Read more