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I know that my BMW 645 CI 2004 has a chain. Not a timing belt. If you have a chain then you change it only if you here noise (rattle) as chain gets longer over the time. Usually you don't have to change on normal car but you may change on 645 as there is a lot of power.

You can check if you have chain or belt by opening a cap where you fill your engine oil.

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10y ago
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Q: When to change timing belt on 2005 BMW 645ci?
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