You should change spark plugs based on the type of spark plug and your vehicle's maintenance schedule.
- Copper spark plugs typically need replacement every 25,000 to 30,000 miles.
- Platinum and iridium spark plugs last longer, usually between 60,000 to 100,000 miles or more.
- Many modern vehicles recommend changing spark plugs between 30,000 and 90,000 miles depending on the make and model.
- Some manufacturers even extend intervals to 100,000 miles or beyond, but it is best to follow the vehicle owner's manual recommendation for your specific car.
Signs you might need to replace spark plugs sooner include reduced engine performance, rough idling, engine misfires, slow or hard acceleration, and poor fuel economy. Also, if the check engine light is on indicating a misfire, it might be time to replace them. Routine replacement helps maintain best fuel economy, reliable combustion, smooth starts, and fewer harmful emissions. In summary, check your owner’s manual for the recommended interval, but typically changing spark plugs every 30,000 to 100,000 miles depending on type and vehicle is advised.
