When to change timing chain on 2004 6 series BMW?

The timing chain on a 2004 BMW 6 Series typically does not have a specific replacement interval, as it is designed to last the life of the engine. However, it's advisable to inspect the chain and related components if you notice symptoms like rattling noises from the engine or poor performance. Regular maintenance and oil changes can help prolong its lifespan. If you're unsure, consult with a professional mechanic or refer to the owner's manual for guidance.