Steyr S23

Differential fluid capacity & service interval

Steyr S23 differential fluid capacity ranges from 2,5 to 5 liters. Service intervals include checking at 20000 km and changing at 40000 km or 12 months. The data covers 2 configurations.

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

TypeSpecifications
  • 15S23 4x4 (1988-1996)
  • Front
  • Use: Normal
  • Capacity 2,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • 15S23 4x4 (1988-1996)
  • Rear
  • Use: Normal
  • Capacity 5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months

Additional Notes

  • The rear differential on the Steyr S23 15S23 4x4 holds 5 liters, which is double the 2.5-liter capacity of the front differential, reflecting the greater size and load-bearing role typical of rear axle assemblies in this class of vehicle.
  • Both the front and rear differentials share identical check intervals of 20,000 km, meaning fluid condition and level inspections fall on the same schedule across both axles.
  • The change interval for both differentials is set at 40,000 km or 12 months, whichever comes first, applying a dual trigger that accounts for both mileage accumulation and time-based fluid degradation.
  • All differential fluid specifications for the 15S23 4x4 covering 1988-1996 are listed under normal use conditions, meaning the stated intervals apply to standard operating environments rather than severe-duty cycles.
  • The combined differential fluid capacity across both axles totals 7.5 liters, a figure relevant when planning a full-system service fill for the 15S23 4x4.

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