Porsche 928 (EU)

Power steering fluid capacity & service interval

Porsche 928 (EU) models require 0,7 liter of power steering fluid. Service intervals include checks at 20000 km or 12 months. The data covers 6 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
928 GTS (1991-1995)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km/ 12 months
928 GT (1989-1992)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km/ 12 months
928 S4 (1986-1992)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km/ 12 months
928 S (1984-1986)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km
928 S (1980-1984)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km
928 (1977-1982)
  • Use: Normal
  • Capacity 0,7 liter
  • Check 20000 km

Additional Notes

  • A 0.7 liter capacity is a relatively small volume, consistent with a power steering reservoir service fill rather than a full hydraulic system overhaul, which would typically require a larger quantity to account for fluid throughout the rack, pump, and lines.
  • The Porsche 928 (1977-1982) and 928 S across both its 1980-1984 and 1984-1986 production spans share an identical check interval of 20000 km, with no time-based component attached to that interval.
  • Beginning with the 928 S4 (1986-1992), the check interval gains a dual condition: 20000 km or 12 months, whichever comes first. The same dual condition applies to the 928 GT and 928 GTS. A time-based threshold of 12 months means fluid condition is evaluated on a calendar basis regardless of distance driven, which is relevant for low-mileage use.
  • The 928 S spans two distinct specification periods, 1980-1984 and 1984-1986, both carrying the same 0.7 liter capacity and 20000 km check interval, indicating no change in power steering fluid specification across that model's mid-production revision.
  • Across all six configurations covering 1977-1995, the power steering fluid capacity remains constant at 0.7 liter, meaning reservoir volume did not change despite the range of engine and trim variants represented in the 928 lineup.
  • The shift from a distance-only interval to a combined distance-and-time interval, seen from the 928 S4 onward, reflects a broader service philosophy where fluid degradation over time is treated as a factor independent of vehicle use.

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