BMW Genuine Spark Plug Set to suit BMW 3 Series 2.0L Turbo Petrol models built from 2017 to 2021, supplied ready to fit with no modification required. Factory gap is set at 0.7mm and heat range 5 matches the original equipment specification. A trivalent metal plating on the shell resists corrosion and seizing in aluminium heads. The Platinum centre electrode is 0.7mm in diameter, which lowers the voltage needed to jump the gap and improves cold starting. Replacing plugs as a full set keeps cylinder-to-cylinder combustion even and prevents misfire codes. Service life of up to 100,000km is typical in normal conditions. Ribbed insulator construction prevents flashover to the coil boot. Check the fitment list against your build date and VIN before ordering, as running changes were made mid-generation. Every unit is supplied new with a 24 Months warranty against manufacturing defect.