How often should NGK spark plugs be replaced?
3 Answers
NGK iridium platinum spark plugs generally need to be replaced every 80,000 to 100,000 kilometers. If spark plugs are not replaced for a long time, it can lead to decreased vehicle power and increased fuel consumption. Methods to determine spark plug electrode gap: The electrode gap of new spark plugs is about 0.8mm. Once the gap reaches 1.5mm or more, replacement is needed. The need for replacement should be judged based on the degree of metal corrosion and carbon deposits. Effects of not replacing spark plugs: If the spark plugs do not fire properly when not shifting gears, it can cause cylinder misfires, reduced power, or even engine stalling. The most direct impact of not replacing spark plugs in time is reduced engine ignition efficiency, which affects engine power and fuel consumption.
I've been driving for almost 30 years and have changed spark plugs countless times. For brands like NGK, the standard copper-core ones typically need replacement every 20,000 to 30,000 kilometers, depending on the vehicle's condition. Older cars or manual transmission vehicles tend to wear them out faster. Delaying replacement can lead to hard starts and skyrocketing fuel consumption. Platinum or iridium spark plugs are more durable, lasting 60,000 to 100,000 kilometers. Driving habits also affect lifespan—frequent acceleration in city traffic can cause carbon buildup and premature failure. Always follow the maintenance manual's recommended intervals. Once, I procrastinated for six months and ended up with sluggish ignition and poor acceleration, forcing me to rush to the shop. Better to address small issues before they become big ones.
DIY car repairs are my little hobby. I've researched the replacement frequency for NGK spark plugs: copper-core ones need changing around every 30,000 kilometers, while platinum or iridium ones can last 70,000 to 80,000 kilometers without issues. However, it depends on the engine type and driving frequency. Frequent long-distance driving is easier on them, but lots of short trips mean you should check them earlier. Replacing them yourself isn't hard—just prepare a socket tool to remove the old ones and install the new ones, ensuring the heat range matches correctly. Watch for symptoms like crackling sounds during startup or idle vibration, as these can save you money and hassle.
