what are these noises?

Years ago I had a ford pickup I bought new. At about 70000 miles the power steering pump started whining. I added about a teaspoon or two of STP. It quit whining. Tens of thousands of miles later it started again. Added the STP again and it quit. Retired the truck after three engine rebuilds, and about 250,000 miles and never replaced the power steering pump. Maybe I was just lucky but figured I didn't have much to lose by trying it.
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