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The 2001 BMW 330i features a timing chain instead of a belt, which is a common feature in most modern cars. Chains, being constructed of metal, are more durable than rubber belts, which are more susceptible to wear and tear. Belts need to be replaced periodically due to their vulnerability to degradation, whereas timing chains can last the entire lifespan of the vehicle or may need replacement just once. Car manufacturers have largely shifted from using belts to chains as a more reliable option. Regular oil changes for engine maintenance also help maintain the timing chain, as it is part of the engine block.
The 2001 BMW 330i is equipped with a timing chain.