Steyr S31

Transfer case fluid capacity & service interval

Steyr S31 transfer case fluid capacity is 4,5 liters. Service intervals include checking at 20000 km and changing 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
19S31 4x4 (1988-1996)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200
26S31 6x6 (1988-1993)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200
32S31 6x6 (1988- )
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200

Additional Notes

  • The Steyr S31 transfer case fluid capacity is 4.5 liters across all three configurations listed: the 19S31 4x4, the 26S31 6x6, and the 32S31 6x6.
  • A 4.5-liter capacity is a relatively substantial fill volume for a transfer case, which is consistent with the heavy-duty military and utility nature of the S31 platform and its multi-axle drivetrain demands.
  • The check interval for transfer case fluid is set at 20,000 km under normal use conditions across all listed configurations, meaning fluid level inspection is due at half the frequency of a full fluid change.
  • The fluid change interval is specified at 40,000 km or 12 months, whichever comes first, under normal use conditions. The inclusion of a time-based limit alongside a distance-based one reflects that fluid degradation can occur through age even when mileage accumulation is low.
  • The 19S31 4x4 covers the 1988-1996 model years, while the 26S31 6x6 spans 1988-1993, and the 32S31 6x6 carries a starting year of 1988.
  • Despite the difference between a 4x4 and 6x6 drivetrain layout, the transfer case fluid capacity and service intervals are identical across all three configurations at 4.5 liters, 20,000 km checks, and 40,000 km or 12-month changes.

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