Built to original equipment form, fit and function, the NGK Spark Plug Set covers Mazda CX-5 and Mazda3 2.5L Petrol models built from 2016 to 2025. Factory gap is set at 1.0mm and heat range 6 matches the original equipment specification. Replacing plugs as a full set keeps cylinder-to-cylinder combustion even and prevents misfire codes. A trivalent metal plating on the shell resists corrosion and seizing in aluminium heads. Service life of up to 120,000km is typical in normal conditions. Check the fitment list against your build date and VIN before ordering, as running changes were made mid-generation. Supplied new and backed by a 3 Years / 60,000 km warranty.