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I think the use of synthetic helps the service life of parts more than the power its freeing up. That being said, the most neglected power steering pumps either outlast the car or they quit for "no reason," something defective inside eventually fails. I throw syn in my manual transmissions, and syns in my engine oil, because they thrash and heat up much more than any PS system. I think at 9 bucks a quart id just change with cheap stuff. With three quarts the money saved can almost fill up my car. 300 miles.
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