I work at grease monkey, dark colored fluid is only a sign... Go by mileage, for most vehicles it is recomended every 30k. Changing it can be hard, but we have a machine that does it for us, cleans it out and puts new redish clear fluid in. Gets about 98% of the bad fluid.
For the squeeky noise, thats mostly caused if the fluid is low. I've changed many power steering fluids and I recommend that u dont wait til it gets dark black. Hard to get it clean after that. Go by mileage from manual.
For the squeeky noise, thats mostly caused if the fluid is low. I've changed many power steering fluids and I recommend that u dont wait til it gets dark black. Hard to get it clean after that. Go by mileage from manual.