Regular replacement of spark plugs is a necessary measure to ensure the efficient operation of the engine, whose core function is to ignite the air-fuel mixture via electric sparks to power the vehicle. As the mileage increases, the gap between the spark plug electrodes will widen due to arc erosion, leading to a decrease in ignition energy and causing issues such as difficulty in starting, acceleration lag, and engine vibration. Taking mainstream models as an example, nickel alloy spark plugs are recommended to be replaced every 20,000-30,000 kilometres, platinum ones can be extended to 40,000-60,000 kilometres, and high-performance iridium spark plugs have a lifespan of up to 80,000-100,000 kilometres. However, the actual replacement cycle needs to be adjusted based on driving habits-for instance, frequent short-distance driving or prolonged traffic congestion will accelerate electrode carbon buildup. Even if the vehicle can start normally, aged spark plugs will still reduce fuel efficiency by about 5-10%, and long-term failure to replace them may also damage key components such as the three-way catalytic converter. This not only maintains optimal power output but also avoids higher subsequent maintenance costs.
