BMW 730d M57 Timing Chain Rattle on Cold Start
The M57N and M57N2 engines in E65/E66 730d develop timing chain rattle on cold start as the chain stretches and guides wear. The noise typically lasts 5-15 seconds before disappearing as oil pressure builds. Ignoring this leads to chain jump and catastrophic valve damage. Chain replacement requires significant disassembly. Always replace the full kit including guides and tensioner.
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