Use only what is recommended in the manual. OEM is best.

In the subject of changing PSF, the proper method is:

1. Put the front end of the car on jack stands
2. Remove as much PSF from the reservoir with a suction tool such as a turkey baster
3. Unclip the return hose from the reservoir and inset it inside an old container
4. Have somebody hold the container as you start the engine and turn the steering lock to lock. Do this several times until no more fluid is coming out of the return hose
5. Turn off the engine and reconnect the return hose
6. Pour new PSF into the reservoir and start the engine
7. Have somebody turn the steering lock to lock to bleed the system while you pour PSF fluid until it reaches the max level
8. Cover up the reservoir and clean up any spillage and you're done