How many kilometers should a Volkswagen Bora's spark plugs be replaced?

[StJohn]

Volkswagen Bora's spark plugs should be replaced every 20,000 kilometers. The original spark plugs are standard nickel alloy type, with the model number F7HER2. Spark plugs are crucial components in a gasoline engine's ignition system. They introduce high-voltage electricity into the combustion chamber, creating a spark across the electrode gap to ignite the air-fuel mixture in the cylinder. They mainly consist of a terminal nut, insulator, terminal pin, center electrode, side electrode, and shell. Generally, spark plugs should be replaced every 40,000 to 60,000 kilometers under normal maintenance conditions. However, this can vary depending on the brand and engine type, so it is advisable to follow the vehicle's manual. For reference, the following standards can be used for maintenance replacement: platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs between 60,000 to 80,000 kilometers.