BMW specialists oop North

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My brother has a 200k mile 2008 520d with some noisy engine issues.

The BMW dealer thinks it needs a new crankshaft and that the timing chain is catching on the housing. How they've found this without stripping it down I don't know!


Can anyone suggest a good specialist for a second opinion?


He lives near Chester but works all over so anyone north of about Birmingham is fine. Ideally someone with experience of the engine and its common faults.


Thanks