How Often Should Spark Plugs Be Replaced in Regular Cars?
2 Answers
Regular car spark plugs should be replaced every 20,000 to 30,000 kilometers, platinum spark plugs can last 80,000 to 100,000 kilometers, and iridium spark plugs can last 30,000 to 40,000 kilometers. The method for replacing spark plugs: Open the engine plastic cover, locate the engine high-voltage distributor wires, remove the high-voltage wires one by one, use a spark plug socket to remove the spark plugs, taking care to prevent dust and debris from falling in, place the new spark plugs into the spark plug holes and tighten them with the socket, then reattach the high-voltage wires to the spark plug holes. If the spark plug electrodes show signs of melting, erosion, rounding, or if the insulator has scars, cracks, or carbon buildup, it indicates that the spark plugs are damaged. Although the car can still be driven for a short time, the spark plugs should be replaced promptly.
I've been driving for over twenty years, and when it comes to spark plugs, delaying replacement can cause a host of problems. Generally, it's best to replace them every 30,000 kilometers or every two years—check your owner's manual first, as recommendations vary by manufacturer. From my experience, delaying replacement leads to slower ignition, especially during cold starts, and a noticeable increase in fuel consumption—a full tank won’t take you as far as before. Severely worn spark plugs can cause engine misfires, leading to rough idling and reduced comfort. Heavy carbon buildup may even trigger engine misfires, resulting in higher repair costs. I recommend checking the electrode gap during each maintenance service. Standard spark plugs should be replaced every 30,000 km, while premium iridium or platinum ones can last up to 50,000 km. Don’t skimp—regular replacement avoids major headaches and keeps your engine running smoothly.
