How Often Should Spark Plugs Be Replaced in a New Car?
2 Answers
New cars typically require spark plug replacement every 30,000 to 40,000 kilometers. The function of spark plugs is to generate sparks through the discharge phenomenon between electrodes, using forced ignition to ignite the air-fuel mixture. Since gasoline engines rely on the timely combustion of fuel and air mixture to generate power, gasoline as fuel is difficult to self-ignite even under high temperatures. Therefore, it's necessary to use sparks for proper ignition. When replacing spark plugs, it's crucial to do so when the engine is cold. This is because spark plugs expand when hot, making the bolts and threads tightly bound together. Replacing them while hot can easily cause thread stripping or breakage. Replacing spark plugs when the engine is cold is much easier and reduces the risk of thread damage.
As someone who has been repairing cars for over a decade, I believe the replacement interval for new car spark plugs mainly depends on their type and driving habits. Conventional copper-core spark plugs typically need replacement around 30,000 kilometers, while platinum or iridium ones can last 80,000 to 100,000 kilometers. New cars usually don't have issues initially, and you generally don't need to worry for the first two years. However, it's best to have a technician check the spark plug condition during every 10,000-kilometer maintenance service to assess carbon buildup. Driving style also significantly impacts spark plug life—frequent stop-and-go traffic in cities accelerates carbon accumulation and shortens their lifespan. I've seen many beginners neglect this, leading to ignition difficulties or increased fuel consumption, and eventually sudden breakdowns. I recommend following the intervals suggested in your vehicle's manual while adjusting for your driving habits, and performing regular maintenance to avoid costly repairs later.
