33,000 miles Automatic 04 GTO. I was checking my fluids and i saw that my power steering fluid is just below the minimum line. I looked in my owners manual and came to find out it takes Dexron III Automatic transmission fluid. I was wondering what do you use for power steering fluid in your GTO. I went you pep boys and all i found was Proline transmission fluid with dexron III. Also, should i just fill up to the line what i need or do a flush? Thanks for looking