2005 Mercedes-Benz S430 4MATIC Q&A

2005 Mercedes-Benz S430 4MATIC Question: I have a slight howl that sounds like low fluid on my car what could that be

When I start it up it is louder than it is after running it for a while -
Answer 1
have all fluid levels ck or poss p/s rack issue -
Answer 2
sounds like a possible power steering issue -