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ticking can be a number of things:
- noisy injector - get them serviced at rce or similar. easy.
- stuck lifter - there's a cleaning product you can run through the engine, otherwise an invasive fix.
- piston slap - bad news. will also present as excessive oil consumption (as oil weeps past scoring on cyl walls).
i've not tried it, but apparently some listening with a stethescope can isolate where the noise is coming from and help determine the cause.
futher, this is 'internet common knowledge' for the m96/m97; nut sure if you have an m97 or direct injection?
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