Denso Spark Plug Set to suit Mazda CX-3 and Mazda CX-5 and Mazda3 2.0L Petrol models built from 2015 to 2023, supplied ready to fit with no modification required. A trivalent metal plating on the shell resists corrosion and seizing in aluminium heads. The Iridium centre electrode is 4.0mm in diameter, which lowers the voltage needed to jump the gap and improves cold starting. Factory gap is set at 0.8mm and heat range 5 matches the original equipment specification. Ribbed insulator construction prevents flashover to the coil boot. Service life of up to 90,000km is typical in normal conditions. Replacing plugs as a full set keeps cylinder-to-cylinder combustion even and prevents misfire codes. Supplied new and backed by a 24 Months warranty.