How often should the original Mercedes-Benz spark plugs be replaced?

[StLucy]

Mercedes-Benz original spark plugs are NGK iridium-platinum spark plugs, model 90654. If they are iridium spark plugs, the replacement interval is 60,000 to 80,000 kilometers, while platinum spark plugs should be replaced every 40,000 kilometers. Spark plugs are a crucial component of a gasoline engine's ignition system. They introduce high-voltage electricity into the combustion chamber and create a spark by jumping the electrode gap, thereby igniting the combustible air-fuel mixture in the cylinder. They mainly consist of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. Generally, spark plugs should be replaced after 40,000 to 60,000 kilometers under normal maintenance conditions. However, this may vary depending on the brand and engine, so it is recommended to follow the owner's manual. Additionally, damaged spark plugs should be replaced promptly. Signs of damaged spark plugs include difficulty starting the engine, reduced power, excessive exhaust emissions, and increased fuel consumption.