duowing

I'm leaking some power steering fluid, I need to track down exactly where it's leaking from, but it's primarily pooling up on that splash pan. Anyway I wasn't sure what to refill it with, I went out and bought power steering fluid, but now I'm hearing that may be bad as I should have used the Dexron ATF? Is there a big difference between the auto parts store Power Steering Fluid and the Dexron ATF?