Ford Edge Explorer Mustang Iridium Spark Plug SP548 CYFS12F1 Strong Ignition

Ford Edge, Explorer, Mustang (2000s onwards) use iridium spark plugs SP548 / CYFS12F1; iridium electrodes with high-temperature and wear resistance outperforming standard nickel alloys. More stable ignition; typical life extends to 80,000–100,000 km. OEM number CYFS12F1 provides strong ignition, improves acceleration response and fuel economy. Install with dedicated spark plug socket; torque control 20-30 Nm to avoid over-tightening and thread damage; difficulty moderate.