How Often Should Original Spark Plugs Be Replaced?
2 Answers
Under normal maintenance conditions, automotive spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow the user manual. The following standards can be referenced for maintenance and replacement: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, and remove the high-voltage ignition wires. Mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust and ensure they are thoroughly cleaned. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, and then use the socket to tighten them further. Reinstall the removed high-voltage ignition wires in the firing order and secure the cover.
Having driven for over a decade, the replacement interval for factory spark plugs truly depends on the vehicle model and driving habits. New car manuals typically recommend changing them every 30,000 to 100,000 kilometers. For instance, the manual for my economy car suggests inspection and replacement at 40,000 kilometers. Standard copper-core spark plugs have a shorter lifespan, needing replacement every 30,000 to 50,000 kilometers. Delaying replacement can lead to poor ignition, resulting in sluggish acceleration and even increased fuel consumption. On the other hand, iridium or platinum spark plugs last longer and can easily reach 80,000 kilometers. The key is to have a technician check them during regular maintenance. For example, since I mostly drive short urban trips, I inspect my spark plugs every six months for issues like carbon buildup or electrode wear—replacing them immediately if any abnormalities are found, rather than waiting until the engine starts shaking. Developing this habit can save a lot on repair costs.
