Porsche 928 (EU)

Manual transmission fluid capacity & service interval

Porsche 928 (EU) manual transmission fluid capacity ranges from 3,8 to 4,5 liters. Service intervals include checking at 20000 km or 12 months, and changing 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)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • Code: 5/1
928 GT (1989-1992)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • Code: 5/1
928 S4 (1986-1992)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km/ 12 months
  • Change 80000 km/ 48 months
  • Code: 5/1
928 S (1984-1986)
  • Use: Normal
  • Capacity 3,8 liter
  • Check 20000 km/ 12 months
  • Change 80000 km
  • Code: 5/1
928 S (1980-1984)
  • Use: Normal
  • Capacity 3,8 liter
  • Check 20000 km/ 12 months
  • Change 80000 km
  • Code: 5/1
928 (1977-1982)
  • Use: Normal
  • Capacity 3,8 liter
  • Check 20000 km/ 12 months
  • Change 80000 km
  • Code: 5/1

Additional Notes

  • The Porsche 928 (1977-1982) and 928 S across both its 1980-1984 and 1984-1986 production periods share a transaxle manual fluid capacity of 3.8 liters, while the 928 GT, 928 GTS, and 928 S4 all specify a notably larger 4.5-liter capacity.
  • The capacity increase from 3.8 liters to 4.5 liters coincides with the later, higher-specification variants of the 928 lineup, reflecting differences in transaxle unit design rather than a simple model year progression.
  • All six configurations carry a fluid check interval of every 20,000 km or 12 months, whichever comes first, under normal use conditions.
  • The fluid change interval for the 928 (1977-1982) and both 928 S periods is stated as 80,000 km with no accompanying time limit, whereas the 928 GT, 928 GTS, and 928 S4 add a 48-month ceiling to the same 80,000 km distance interval.
  • The addition of a 48-month time-based change limit in the later variants means fluid replacement is triggered by whichever threshold arrives first, distance or elapsed time, preventing extended service life in low-mileage applications.
  • The 928 S4 (1986-1992) shares both the 4.5-liter capacity and the 80,000 km / 48-month change interval with the 928 GT (1989-1992) and 928 GTS (1991-1995), indicating a consistent transaxle service specification across these three variants.
  • All specifications listed apply to normal use conditions, meaning the intervals and capacities stated are not adjusted for severe-duty operation in any of the six configurations.

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