Stop Leak works by swelling a worn or perished gasket/seal or filling pin hole gaps, I doubt it will 'recondition' an old sealant so you might not get any benefit anyway. I hate adding that crud into an engine, tranny, PS system or any other finely engineered system. At best, the stuff is only a temporary measure a bit like foam puncture repairs, I suggest just concentrate on getting the real fix done.
TR Laredo is right, get to a good mechanic and steer well clear of dealers.
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MY13 GC Laredo CRD - gone but not forgotten
MY23 Skoda Octavia MKIV wagon - fully loaded
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