Why change power steering fluid? It's not like oil, where it is exposed to firing pistons and combustion fouling. Unless you get dirt or other contaminants in it, it should last indefinitely.The dealership said it was time to flush the old power steering fluid on my 2003 Tundra V8. They were asking WAY too much, and I feel i can do this on my own. Any suggestions on the best way and what type of fluid?