How many kilometers should the timing chain be replaced?

[Lila]

There is no specific requirement for when the timing chain needs to be replaced. It should be replaced only when the chain becomes deformed and produces abnormal noises after prolonged use. The service life of the timing chain is closely related to the engine oil used for regular vehicle maintenance. The chain does not directly rub against the sprocket but is lubricated by the engine oil. The timing chain, also known as the timing belt, primarily drives the engine's valve train, ensuring that the engine's intake and exhaust valves open and close at the appropriate times to allow normal air intake and exhaust in the engine cylinders. In some vehicle models, such as the Volkswagen Jetta, Santana 2000, and Audi, the timing belt also serves the additional task of driving the water pump.