[Outback2002]

I just flushed mine. Bought the Subaru ATF fluid and pumped out the reservoir with a hand pump to the screen. I then disconnected the reservoir return line and put it in a bottle. I then started the car and let the power steering pump push the rest of the old fluid out the return line into the bottle while a friend kept pouring in new fluid into the resevoir. It goes pretty quick as the pump has a lot of capacity. This method might get some air into the system but you just keep turning the wheel back and forth with the return line connected back to the reservoir until there are no more bubbles showing up in the fluid. This method worked pretty good as a way to ensure all the old fluid gets flushed out. make sure you put the front end on jack stands so you can freely move the wheel back and forth. The Subaru brand ATF fluid is red and is the recommended power steering fluid for the car. I used about two quarts to do the flush, and its just as cheap as other brands. 2002 Outback 2.5

 

[Outback2002]

The engine was only on to run the pump and clear any air bubbles so it was not that warm. I checked it a week after and topped it off to max cold on the reservoir after it sat all night as it was between min cold and max. I bought the fluid by the quart, you should be able to do this even online or go to the dealer if you have one near you. I prefer to use the Subaru chemicals so I know there is no question of compatability.