How Often Should Car Spark Plugs Be Replaced?
2 Answers
Car spark plugs should be replaced every 30,000 kilometers or every 2 years. Below is relevant information about spark plugs: 1. Prolonged failure to replace spark plugs will affect the car's ignition performance, and long-term use can also lead to carbon buildup. The ignition coil can only provide a limited voltage. Even with normal use, as the spark plug electrodes wear down, the voltage required to bridge the spark plug gap continuously increases. Therefore, during rapid acceleration, high speeds, or heavy loads, misfires may occur, leading to vehicle shaking, difficulty accelerating, and fuel wastage. Thus, spark plugs need to be replaced regularly to keep the engine running at its best, which also helps save fuel. 2. The replacement cycle of spark plugs is directly related to their material. Nickel alloy spark plugs should be replaced every 20,000 to 30,000 kilometers, nickel-yttrium alloy spark plugs every 30,000 kilometers, single platinum spark plugs every 40,000 kilometers, double platinum spark plugs every 60,000 kilometers, iridium spark plugs every 80,000 kilometers, and platinum-iridium alloy spark plugs can last up to 100,000 kilometers before needing replacement.
I remember when I first started driving, I often forgot about spark plugs. Later, my car had unstable idling and increased fuel consumption, and that's when I realized they needed replacement. Generally, the replacement interval for spark plugs is between 20,000 to 60,000 kilometers, or every 2 to 4 years, depending on the spark plug material and your driving habits. The copper-core spark plugs I used only lasted 20,000 kilometers because of frequent short trips in the city, which led to carbon buildup. After switching to more durable iridium spark plugs, they now last over 60,000 kilometers and still run smoothly. Regular inspections are crucial—don’t wait until the engine starts shaking or you have trouble starting the car. I recommend having the mechanic quickly check the spark plug condition during every maintenance visit. Replacing them early can save fuel, improve startup speed, and protect the engine from major repairs. DIY replacement is simple, but make sure to apply the correct torque and avoid overtightening.
