Hi, I have a 02 S80 she is my first car and i got her for my 16th birthday. It's not the turbo model and is close to 95,000 on the dash the other day i started noticing this problem that i required more revolutions to turn my wheel a certain distance and had to correct my self at corners. So i popped the hood and say some black fluid around the PS fluid reservoir. I really don't know and rather get your expert opinion before i take it into the money vacuuming delaers.

Thank You

 

Maybe the fluid level is just low. Check it and see how low it is.