I had a leaking seal with my pump. Adding 10% (by volume) of one of the "stop leak" products has SEEMED to have at least slowed the leak. My problem was not squeeling, but throwing ps fluid all over inside the engine bay, particularly onto the fan, which of course slings it all over.

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Jeff Naumann
Torrance, California
1972 220D 138k miles (sold)
1982 300SD 263k miles
1989 BMW 750iL 183k miles
1993 Dodge D250 Cummins 5.9 202k Miles