Why is my BMW 6 Series's engine making a strange rattling noise?

I recently noticed that my BMW 6 Series's engine is making a strange rattling noise while idling. It seems to go away when I start driving, but it's really worrying me. What could be causing this and how can I fix it?

Hi Emily, it sounds like the issue could be with your timing chain tensioner. This is a common problem with BMW 6 Series engines and can result in a rattling noise. I would recommend taking your car to a certified BMW mechanic to get it checked and replaced if necessary.

Emily, have you noticed any decrease in engine performance or leaks? It could be a problem with your valve lifters, especially if your car has high mileage. I would suggest getting them inspected and replaced if needed.

Hey Emily, the rattling noise could also be coming from your exhaust system. Check for any loose or damaged parts and have them fixed or replaced by a professional.