Engine/Transmission (1998.5 - 2002) Power steering pump problem

[DPike]

Yesterday, my ps pump puked fluid out the top rather than turning the wheels. It has done this twice (once last winter), usually when I don't have time to let it warm up for very long. It also groans in colder weather. Will synthetic fix this? How do I change the oil, and which oil is best to use? I am in Vermont, and the temps can be from -40 to 100. Thanks