I could be wrong, but I think the timing chain guide rail issue is more prone with the M62TU V8s (2000-03) moreso than the N62 (2004-06)...I'll let the professional wrenches chime in about this.

The N62 suffers more with the violent shaking upon cold start-up from the valvetronic intermediate levers vs the timing chain guides on the M62TU.

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