Spark Plug DENSO SK20HR11 (3421)

The DENSO SK20HR11 (3421) Iridium spark plug is part of the Iridium Long Life series, engineered for modern engines to provide an extended service interval of up to 100,000 km. Featuring a 0.7mm iridium-tipped center electrode and a platinum chip on the ground electrode, it ensures consistent spark delivery even under extreme thermal stress. This model features a heat range of 20, a long reach thread (26.5 mm), and a 1.1 mm gap. Using these plugs helps reduce fuel consumption, improves cold start performance, and minimizes misfires. It is widely used in Toyota vehicles (including Camry, RAV4, Land Cruiser) and Lexus models, meeting strict OEM standards for combustion efficiency and engine reliability.