How often should the spark plugs be replaced for the Tiguan 1.8T?

[JoannaLee]

Volkswagen Tiguan 1.8T's official recommendation is to replace the spark plugs every 20,000 km (25,000 km for the first replacement). Due to the high technical content of the TSI engine, most of the parts are imported, especially key components such as oil filters and spark plugs. More details are as follows: 1. The spark plug is a component in the gasoline engine's ignition system that introduces high-voltage current into the cylinder to generate an electric spark, igniting the combustible gas mixture. It mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell, with the side electrode welded to the shell. 2. In short, a car engine operates by burning fuel, and the electric spark that ignites the fuel is generated by the spark plug. Therefore, the quality of the spark plug affects the engine's performance. 3. The main factor affecting a faulty spark plug is the gap between the electrodes. If the gap is too small, the spark will be weak and prone to carbon buildup and leakage. If the gap is too large, the required breakdown voltage increases, making the engine harder to start and more likely to misfire at high speeds.