Steyr S25

Manual transmission fluid capacity & service interval

Steyr S25 manual transmission fluid has a capacity range of 8 to 8,5 liters. Service intervals include a check at 20000 km and a change at 40000 km or 12 months. The data covers 4 configurations.

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

TypeSpecifications
19S25 (4x2) (1988-1993)
  • Use: Normal
  • Capacity 8,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: ZF 16S-109 16/1
19S25 (4x2) (1988-1993)
  • Use: Normal
  • Capacity 8 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: ZF 9S-109 9/1
19S25 (4x4) (1988-1993)
  • Use: Normal
  • Capacity 8,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: ZF 16S-109 16/1
19S25 (4x4) (1988-1993)
  • Use: Normal
  • Capacity 8 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: ZF 9S-109 9/1

Additional Notes

  • The Steyr S25 manual transmission fluid specifications cover the 19S25 in both 4x2 and 4x4 drivetrain configurations across the 1988-1993 model years.
  • Two distinct capacity values appear within each drivetrain configuration: 8.5 liters and 8.0 liters. In manual transmission servicing, differing fill capacities for the same unit typically reflect variations between a dry fill after a full overhaul and a service fill following a fluid drain, where residual fluid remains in the housing.
  • The 4x2 and 4x4 configurations share identical capacity values of 8.5 liters and 8.0 liters respectively, indicating no capacity difference attributable to drivetrain layout alone.
  • All four specification rows carry a normal use condition, meaning the stated check and change intervals apply to standard operating circumstances rather than demanding or severe-duty cycles.
  • The fluid check interval is set at 20,000 km across all configurations, establishing a periodic inspection point at half the full change interval.
  • The fluid change interval is defined by a dual threshold of 40,000 km or 12 months, whichever occurs first. A time-based limit alongside a distance-based one accounts for vehicles that accumulate low mileage, where fluid degradation can still occur through moisture absorption and oxidation over time.

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