Steyr S25

Differential fluid capacity & service interval

Steyr S25 differential fluid capacity ranges from 6 to 21 liters. Service intervals include checks at 20000 km and changes at 40000 km or 12 months. The data covers 3 configurations.

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

TypeSpecifications
  • 19S25 (4x2) (1988-1993)
  • Rear
  • Use: Normal
  • Capacity 21 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • 19S25 (4x4) (1988-1993)
  • Front
  • Use: Normal
  • Capacity 6 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: (4x4)
  • 19S25 (4x4) (1988-1993)
  • Rear
  • Use: Normal
  • Capacity 6 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: (4x4)

Additional Notes

  • The Steyr S25 19S25 in 4x2 configuration carries a rear differential fluid capacity of 21 liters, a notably large fill volume consistent with heavy-duty axle assemblies found in commercial vehicles of this class.
  • Switching to the 4x4 configuration, both the front and rear differentials each hold 6 liters, a substantially smaller figure per unit compared to the single rear differential in the 4x2 variant.
  • The 4x2 rear differential capacity of 21 liters versus the 6-liter capacity per axle in the 4x4 suggests fundamentally different axle designs between the two drivetrain configurations across the 1988-1993 production span.
  • All three differential positions across both drivetrain configurations share an identical check interval of 20,000 km under normal use conditions.
  • The change interval for differential fluid is set at 40,000 km or 12 months, whichever comes first, and applies uniformly to the rear differential on the 4x2 and to both front and rear differentials on the 4x4 under normal use conditions.
  • The time-based component of the change interval, 12 months, means that even low-mileage operation within a calendar year triggers a fluid change obligation, independent of the 40,000 km threshold.

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