I got confused at auto zone a couple months ago and instead of buying Dexron III compatible fluid, I bought ATF+4 on accident. I flushed out my friend's Elantra's power steering system. He has been driving for 30,000 miles on it so far. Is there a big difference between ATF and Dexron? I'm kind of nervous now because he moved to L.A. Can't believe I just caught this mistake last night while reviewing the boards here.