PSD locking system light due to wear in the multi-disc clutch on Porsche 928

Due to wear in the differential multi-disc clutch, the PSD (Porsche Slip Differential) locking system light may illuminate. The independent hydraulic fluid supply for the PSD needs to be maintained properly, including the filling/replacement of fluid before problems develop.
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Average mileage: (–)
5 model years affected: 1990, 1991, 1993, 1994, more1995
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