Hi all, sorry if this is a normal thing:

I am testdriving a 2005 S4 with ~80k on the clock. I was noticing with the hood up what sounds like rattling lifters, similar to the rattle when the car first starts and they are drained of oil, but less loud.

Is this a normal sound to come out of these engines? I have a 2001 A4 on it's third engine, and I really don't want to go through all that fun again... :/

Thanks!