How Often Should Vehicle Spark Plugs Be Replaced?
3 Answers
Spark Plug Replacement Cycle: 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 standards for maintenance 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. Impact of Damaged Spark Plugs: If spark plugs are damaged, it can directly cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, and reduced power. The most significant problem is difficulty in ignition, affecting the normal use of the vehicle. Severe erosion of the spark plug, such as scarring at the top, damage, or melted and eroded electrodes, indicates that the spark plug is damaged and should be replaced. Symptoms of Damaged Spark Plugs in a Car: Damaged spark plugs may exhibit the following symptoms: difficulty starting, low power, excessive exhaust emissions, and increased fuel consumption.
I've been driving gasoline cars for over a decade. Generally, spark plugs need replacement every 30,000 to 40,000 kilometers, but it depends on road conditions and the type of spark plugs used. I use ordinary copper spark plugs, which are cheap but not durable. Last time, I exceeded 35,000 kilometers before replacing them, and the car started shaking with increased fuel consumption. The mechanic said the electrodes were burnt out. If using iridium spark plugs, they might last up to 60,000 or even 80,000 kilometers, but they're more expensive—worth considering based on your budget. I recommend checking them during every 2-year maintenance to avoid major engine issues that could cost more. Additionally, frequent city traffic jams or short trips lead to more carbon buildup, accelerating spark plug wear. Pay special attention during winter when cold starts are difficult—don't wait until you're stranded on the road to regret it.
As an automotive technology enthusiast, spark plug lifespan depends on material type: copper-core ones have the shortest lifespan, around 20,000 kilometers; platinum or iridium long-life types perform better, lasting 50,000 to 80,000 kilometers. I make it a habit to check spark plugs during every oil change – if the electrode gap widens or carbon buildup is excessive, ignition efficiency drops. Slow engine starts or weak acceleration could be warning signs, indicating it's time for replacement. Choosing spark plug brands that match your vehicle model is crucial – don't just buy cheap ones randomly; also note that poor fuel quality affects lifespan, while using quality fuel can extend service life. Modern vehicles feature more durable designs, but regular maintenance is still essential to ensure safety.
