Porsche 928 (EU)

Differential fluid capacity & service interval

Porsche 928 (EU) differential fluid capacity ranges from 2 to 3 liters. Service intervals include checks at 20000 km or 12 months and changes at 80000 km or 48 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)
  • From automatic
  • Use: Normal
  • Capacity 3 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • 928 GT (1989-1992)
  • From automatic
  • Use: Normal
  • Capacity 3 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • 928 S4 (1986-1992)
  • From automatic
  • Use: Normal
  • Capacity 3 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • 928 S (1984-1986)
  • From automatic
  • Use: Normal
  • Capacity 2,7 liter
  • Check 20000 km/ 12 months
  • Change 80000 km
  • 928 S (1980-1984)
  • From automatic
  • Use: Normal
  • Capacity 2 liter
  • Check 20000 km/ 12 months
  • Change 80000 km
  • 928 (1977-1982)
  • From automatic
  • Use: Normal
  • Capacity 2 liter
  • Check 20000 km/ 12 months
  • Change 80000 km

Additional Notes

  • The Porsche 928 (1977-1982) and 928 S (1980-1984) share a differential fluid capacity of 2 liters, which is the smaller of the three capacity figures found across the 928 EU lineup.
  • The 928 S produced between 1984-1986 carries a differential fluid capacity of 2.7 liters, a mid-range figure that sits between the 2-liter specification of earlier variants and the 3-liter specification of later ones.
  • A 3-liter differential fluid capacity applies to the 928 GT (1989-1992), 928 GTS (1991-1995), and 928 S4 (1986-1992), all of which correspond to the later and higher-specification variants in the range.
  • The change interval for the 928 (1977-1982) and 928 S (1980-1984) is stated as 80000 km with no time-based limit, while later variants such as the 928 S4, 928 GT, and 928 GTS add a 48-month maximum alongside the same 80000 km distance figure.
  • A time-based service limit of 48 months means fluid replacement is due at four years regardless of whether the distance threshold has been reached, a condition that reflects the degradation of fluid properties over time independent of mileage.
  • The 928 S (1984-1986) specifies an 80000 km change interval without a time-based counterpart, placing it in the same interval structure as the earliest 928 variants rather than the later 48-month-inclusive format.
  • All six configurations share a check interval of 20000 km or 12 months under normal use conditions, meaning inspection of the differential fluid level is due at whichever threshold is reached first.
  • The differential fluid in all listed configurations is noted as being sourced from an automatic transmission arrangement, which refers to the Porsche 928's transaxle layout where the differential is integrated with the rear-mounted gearbox unit.

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