t walgamuth, that is exactly what I want to hear, I'm going to test drive a w126 maybe from a dealer to compare 'though I can consider mine is normal.Thanks a lot.
Sbourg, thank you for your time reading my post. I'm so sorry if I comfused you on the tittle of my post "hard to steer", what I mean to say is, the steering wheel is heavy compare to the car with a normal power steering system. Like t walgamuth said, it's on the heavy side.