How Often to Change Spark Plug Wires: A Practical Interval Guide
Spark plug wires should typically be changed every 30,000-60,000 miles, or about 50,000-100,000 kilometers, when the vehicle uses conventional ignition leads. Replace them sooner when heat, oil contamination, cracking, arcing, towing, or repeated short trips have degraded the insulation. Many vehicles built after the early 2000s use coil-on-plug ignition and have no conventional plug wires. […]