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328i cars prior to mid 2015 had problems with the 2.0 liter engine with plastic chain guides that failed. This led to a noisy timing chain, and sometimes more serious issues. Some were replaced under a special repair program, but I think that program expired once the engine hit 60k miles. FCP Euro used to sell a kit that provided all the parts and tools to do this fix yourself. You need some special tools to get the engine parts lined up and cam timed during reassembly.
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