Spark Plug DENSO 3439 FXE20HR11

The DENSO Iridium Super Thread FXE20HR11 spark plug (part number 3439) is a premium product designed for modern high-performance engines requiring maximum efficiency. This model features an ultra-fine iridium center electrode, which significantly reduces the required ignition voltage and improves ignitability. The extended thread design (Super Thread) ensures the optimal position of the spark gap within the combustion chamber, which is critical for direct-injection engines. The plug offers exceptional wear resistance, allowing for significantly extended service intervals (up to 100,000 km depending on conditions). The use of precious metals minimizes electrical erosion and guarantees stable performance under extreme temperatures. This part is widely used in Japanese vehicles (Toyota, Nissan, Infiniti), providing fuel economy and engine smoothness.