Why does my Audi A6's engine make a strange noise upon start up?

I have noticed that whenever I start up my Audi A6, the engine makes a strange noise for a few seconds before settling down. It almost sounds like a grinding or rattling noise. Is this something I should be concerned about?

It is likely that the noise you are hearing is coming from the engine's timing belt or tensioner. This is a common issue in Audi A6 models and should be addressed as soon as possible to avoid any potential damage to the engine.