If you are meaning the rough/harsh mechanical noises, it really depends on which engine type you had previously.
I used to own a VW Passat 2.8V6 30V 4Motion and that version of the Audi engine was extremely quiet and smooth at idle - maybe a bit noisy at initial cold start due to chain tensioners taking a bit of time to get sorted out - but only now and again. This 2011 S4 bought at 12.5K miles and now only at 25K miles has always sounded rougher than that older engine.
I started a thread on my engine sounding like there was something light weight and tinny making noises - but I only noticed that after completing an oil change, I never ever lift the bonnet just to check what noises the engine makes at idle when cold or hot - in future I'll do that now and again and definitely just before carrying out an oil change so that I can compare before/after noises. Obviously after an oil change you do look closely under the bonnet and underneath to check that there are no oil leaks.
I left that car unused until I bought another oil filter, just in case I had left something, ie a cloth, in the oil filter base to soak up oil - and had forgotten it, when I removed the just fitted filter I found nothing, so just cleaned up the oil filter case, replaced the O-rings again, and started the engine - no tinny noises! So either the previous filter was duff, which I have no reason to believe (Mann so exactly the same as an Audi sourced one), or I went looking for problems that did not exist after initial start up after changing the oil. I'll leave updating the thread I started until some time/miles have passed.