Why does the Audi A3 engine make a rattling noise on cold starts?

I've noticed that my Audi A3 makes a rattling noise when I start my car on cold mornings. It goes away after a few minutes but I'm concerned about potential engine issues. Is this something I should be worried about?

The Audi A3 is known to have a noisy timing chain on cold starts due to improper tension from the factory. However, this is a common issue and does not necessarily indicate a bigger problem. It's always a good idea to have a mechanic check it out just in case, but in most cases, it's nothing serious.

I've had the same issue with my Audi A3 and took it to the dealership. They fixed it under warranty and explained that it was caused by a loose timing chain tensioner. So if your car is still under warranty, I would definitely bring it to a certified Audi technician.

I had the rattling noise on cold starts as well and after doing some research, I found out that switching to a thicker oil can help alleviate the issue. I've been using 5W-40 in my Audi A3 and the noise has significantly reduced.