Why is my Audi A6's engine making a loud rattling noise?

I just bought an Audi A6 and noticed that the engine is making a loud rattling noise. What could be causing this and how can I fix it?

Hi Maggie, congratulations on your new Audi A6! The loud rattling noise from the engine could be due to a few reasons such as an issue with the timing chain, valves, or spark plugs. It would be best to take your car to a trusted mechanic who specializes in Audi vehicles for a proper diagnosis. Don't hesitate to address this issue as it could potentially lead to more expensive repairs in the future.