I read that O-Rings on a 2007 TL usually need to be replaced. I heard a whining noise and my fluid was low so I replaced one of the O-rings because the outer metal looked like it was leaking. After I replaced it, I filled the reservoir but when I checked the level it went down a bit and there was a small spot of oil on my driveway in that same area. The whining is gone and looks like a smaller leak now. Do both O-rings usually need replacing?

 

keep an eye and see if it's not just residual.

 

If you see oil on the floor, you should easily see where it's coming from. Look from the top at the power steering then cross your fingers and look at the steering rack.

 

I am monitoring the level and it looks as though its residual. The level in the reservoir has not gone down since a few days ago.