How often should the timing chain of a Passat be replaced?

[LaAurora]

According to the Volkswagen maintenance manual, the timing chain is designed to last the lifetime of the vehicle without requiring maintenance. However, with proper care, it is recommended to replace the timing chain every 150,000 kilometers. Here is some relevant information about timing chains: 1. Function of the timing chain: The primary role of the engine timing chain is to drive the engine's valve train, ensuring that the intake and exhaust valves open and close at the correct times. This allows the engine cylinders to properly intake and exhaust air. 2. Comparison with traditional belts: Compared to traditional belt-driven systems, chain-driven mechanisms offer more reliable transmission, better durability, and space efficiency. The entire system consists of gears, chains, and tensioning devices. The hydraulic tensioner automatically adjusts the tension to maintain consistent chain tension, and the system is maintenance-free for the lifetime of the vehicle. This design ensures the timing chain lasts as long as the engine itself, improving safety and reliability while significantly reducing the engine's usage and maintenance costs.