What are the hazards of not replacing spark plugs for a long time?

[OAddyson]

Long-term failure to replace spark plugs can directly cause various problems such as leakage in the vehicle's ignition system, vehicle shaking, increased fuel consumption, difficulty in acceleration, and reduced power. The main issue is difficulty in ignition, which affects the normal use of the vehicle. The purpose of spark plugs is to ignite. During use, the electrodes of the spark plugs consume electricity through spark discharge from areas prone to discharge. Typically, the service life of spark plugs is 15,000 km, while long-life spark plugs can last up to 30,000 km. Generally, as the engine runs or the driving distance increases, the required discharge voltage for the spark plug electrode gap continuously rises, gradually approaching the voltage limit provided by the ignition coil. This makes ignition increasingly difficult and eventually leads to misfiring.