How many kilometers does a car generally need to replace spark plugs?
4 Answers
Under normal maintenance conditions, 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. You can refer to the following maintenance standards for 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. Damaged spark plugs may exhibit the following symptoms: difficulty starting the engine, reduced power, excessive exhaust emissions, and increased fuel consumption. Steps for replacing spark plugs: Open the engine hood, lift the plastic cover of the engine, and remove the high-voltage ignition wires. Mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris such as 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 high-voltage ignition wires in the firing order and secure the cover.
I've been driving for over 20 years, and there's no fixed number for spark plug replacement—it depends on driving habits and vehicle type. For regular cars, they should be changed every 30,000 to 50,000 kilometers. Frequent traffic jams accelerate wear, which can lead to engine starting difficulties or shaking. New cars with high-quality spark plugs, like iridium ones, can last over 80,000 kilometers. My old car uses copper spark plugs, which I replace every 40,000 kilometers on schedule; otherwise, fuel consumption spikes. You can also check them yourself—open the engine hood, and if the spark plugs are heavily carbonized or have turned black, it's time for a replacement. Develop a habit of regular maintenance to avoid small issues turning into major repairs.
The type of spark plug determines the replacement interval. Copper-core ones have a shorter lifespan and generally need replacement around 30,000 kilometers. Platinum or iridium plugs are more durable, lasting up to 60,000 or even 100,000 kilometers. The manufacturer's manual provides specific recommendations—don't just guess. I've encountered many owners who waited too long, resulting in poor ignition and sudden jerking on the highway, which is extremely dangerous. Fuel quality also affects spark plug aging; using higher-grade fuel can extend their life. It's advisable to have them checked at a repair shop every 50,000 kilometers—a small expense to avoid major repairs.
Don't delay replacing spark plugs, typically done between 40,000 to 70,000 kilometers depending on road conditions. Frequent mountain driving or aggressive acceleration accelerates wear - act promptly if you notice delayed starts or engine vibration. Delaying replacement wastes more fuel and may increase emissions. I always remind friends to follow the manual's standards; simple tools allow DIY spark plug condition checks. Safety first, regular maintenance is the wise choice.
