I bought a used 2005 Acura TSX with 89,000 miles. The power steering oil has probably not been changed. I used turkey lube to drain old fluids. The old fluids were SUPER DARK BROWN! I will buy 3-4 bottles to drain and refill several times. I could already feel an improvement on the steering wheel. As I enter a long, tight corner, I feel the steering wheel push backwards, then sloppily again, and then some resistance again. It feels like the horsepower pump is randomly pushing out more fluid, making the steering feel odd and unstable. Now, after a bottle, I noticed that the steering wheel is softer when cornering!