How often should spark plugs be replaced for small cars?

[VonGabriella]

Small car spark plug replacement intervals depend on the material. Nickel spark plugs should be replaced after 30,000 kilometers, platinum spark plugs after 40,000 to 50,000 kilometers, while iridium spark plugs are more wear-resistant and can last 80,000 to 100,000 kilometers. Platinum-iridium alloy spark plugs should be replaced after 100,000 kilometers. Commonly known as spark plugs, their function is to discharge the pulsed high voltage from the high-voltage wire, ionizing the air between the two electrodes to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. Spark plugs are categorized into standard spark plugs and insulator-protruding spark plugs.