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330d were not really a troublesome car but that may also be skewed by its relatively low sales figures.
Usual E90 wear and tear items, plus additional tyre wear from the engine characteristics.
Listen out for the timing chain noise, although 330d's are not as bad as X5/X6 in this issue.
N57 common wear items include the harmonic balancer (rubber tears with age), coolant pump (leak) and various oil blowby leaks escaping from the ventilation hoses/connections and anywhere between the turbo inlet to the throttle body.
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