Hi, I took my car to a mechanic and he said I have a leak in my power steering and need to replace my rack and pinion. How much does this normally cost? And what kind of power steering fluid should I use? I did go to Pep Boys and saw some power steering fluid that has "stop leak" written all over it but not sure if I could use it. I'm new to this site so any comments or suggestions would be appreciated..thanks! :)