"Seal softeners" from what i have been led to believe, supposed to plump up flattened or dried up rubber or some such.
Will confess to trying a Wynns treatment in my old 90, had a limited effect all told. The only real fix is to replace whats leaking.
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-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
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