Spark plugs generally need to be changed every 30,000 to 100,000 miles, depending on the type of spark plug, vehicle make, and model. Here are the key points:
- Conventional spark plugs typically require replacement around every 30,000 miles.
- Modern spark plugs made with platinum or iridium can last much longer, often between 60,000 to 100,000 miles or more.
- Some manufacturers recommend intervals up to 120,000 miles for specific models (e.g., Toyota Sienna).
- The exact replacement interval is best confirmed by your vehicle's owner's manual or manufacturer guidelines.
- Signs that spark plugs need changing sooner include rough idling, slow acceleration, hard starting, illuminated check engine light, and poor fuel economy.
- Mechanics may inspect spark plugs during regular services and replace them only when necessary rather than strictly every year or service.
- For newer vehicles with advanced ignition systems, spark plugs can last longer because the system compensates for electrode wear.
In summary, you should typically change spark plugs every 30,000 to 100,000 miles, guided by your car’s manual and any warning signs of wear or engine performance issues
