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Do you hear any ticking from the valve tappets after pushing the car? This was very common on the M52 generation of engines, particularly after driving hard in corners at low speed. I never quite understood exactly why it happened, but it must have been related to the oil pump. I haven't heard this sound from the new generation of line six engines.
With the M52, you got this very loud sound and some loss of power, but it never seemed to harm the engine. After some "normal" driving, it was okay again.
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