Why does my Audi A5's engine make a rattling noise during cold starts?

I've noticed that my Audi A5's engine makes a rattling noise when I start it in the morning or after it's been sitting for a few hours. It goes away after a few minutes of driving. Is this normal?

The rattling noise you're hearing is likely caused by a lack of proper lubrication in your engine's components. This can happen when the car has sat for a while and the oil has settled. It's usually not a cause for concern, but it's always a good idea to get it checked out by a mechanic to be safe.