What material are the spark plugs in a Mercedes-Benz C-Class?

[OMiranda]

The original spark plugs used in the Mercedes-Benz C-Class are NGK iridium spark plugs from Japan, with a replacement interval of 60,000 to 80,000 kilometers. All four spark plugs need to be replaced at the same time during each replacement. 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. Spark plugs are installed on the side or top of the engine. In earlier models, spark plugs were connected to the distributor via ignition cables. However, over the past decade, most car engines have transitioned to direct connection between the ignition coil and the spark plug. The main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Damaged spark plugs can lead to the following issues: difficulty starting the engine, reduced power, excessive exhaust emissions, and increased fuel consumption. It is important to replace spark plugs promptly when these symptoms occur.