How many kilometers do car spark plugs need to be replaced?
2 Answers
Car spark plug replacement cycle: Ordinary copper-core spark plugs need to be replaced approximately every 30,000 kilometers; precious metal spark plugs need to be replaced approximately every 80,000 kilometers. Strictly speaking, there is no uniform standard answer for how many kilometers car spark plugs need to be replaced, as there are many objective factors that can affect the replacement time. The owner's driving habits, usual road conditions, different car models, different brands, and the quality of the spark plugs will all significantly impact the replacement time. It is recommended to check the vehicle's user manual, which will provide detailed instructions. Simply follow the instructions in the manual for replacement.
I've been repairing cars for over a decade, and spark plugs are what I replace most often. Generally speaking, standard copper spark plugs should be checked or replaced every 30,000 kilometers, platinum ones can last up to 60,000 kilometers, and iridium ones are even more durable, capable of running 80,000 to 100,000 kilometers. But these mileages aren't set in stone—it depends on your driving habits. For example, if you're stuck in city traffic every day with the engine running at low RPMs, the spark plugs will wear out faster. If you do more highway driving, their lifespan will be longer. Additionally, poor fuel quality or an older vehicle can lead to carbon buildup on the spark plugs, causing symptoms like rough idling and weak acceleration. I've seen many owners delay replacing their spark plugs until they fail, which can end up damaging the ignition coils or catalytic converter, leading to costly repairs. To save money and hassle, use a multimeter to check the electrode gap during each maintenance service—replace them if the gap is too wide. Remember, the manual's recommendations are the most reliable; don't make wild guesses yourself.
