NGK (4115) PFR6G-13 Spark Plug - Pack of 4 Highest performance upgrade available for your vehicle, with extreme durability and a 70,000 to 90,000 mile service life. Double precious metal construction uses a Platinum center electrode and Platinum ground electrodes for ultimate engine performance. Designed for the most advanced fuel-injected and turbocharged engines. Precision laser-welded electrode construction. Trivalent Metal Plating has superior anti-corrosion and anti-seizing properties.