NGK SILMAR8A9S / 90992 Spark Plug Iridium

NGK SILMAR8A9S / 90992 Iridium spark plug embodies NGK’s renowned engineering for modern engines. Built on decades of ignition expertise, this 10mm diameter plug uses iridium alloy for a fine electrode, delivering quick, stable sparks and improved combustion stability. Its durable construction resists wear and provides longer service life, helping maintain power, efficiency, and smooth idling across a wide range of automotive applications. Ideal for high-performance and everyday vehicles alike, the SILMAR8A9S is designed to meet rigorous manufacturer specifications while offering reliable cold starts and consistent firing under varied conditions. Choose NGK for trusted ignition technology that supports optimal engine response and fuel economy over time.