Why Do Spark Plugs Need to Be Replaced?

[MacSienna]

Reasons for replacing spark plugs: Long-term failure to replace spark plugs can lead to carbon buildup, which is harmful to the engine. Spark plugs operate in high-temperature and high-pressure environments. After a period of use, part of the electrodes will be eroded, the electrode gap will increase, and the electrodes will oxidize, all of which will shorten the lifespan of the spark plug until it can no longer produce a spark and must be discarded. Spark plugs are made of materials such as nickel alloy, iridium, platinum, and iridium-platinum alloy. Nickel alloy spark plugs need to be replaced approximately every 20,000 kilometers; platinum spark plugs should be replaced around 40,000 kilometers; iridium spark plugs can last between 60,000 to 80,000 kilometers before needing replacement. The specific replacement interval for spark plugs can be referenced from the manufacturer's maintenance manual, which provides recommended replacement cycles.