Steyr S18

Transfer case fluid capacity & service interval

Steyr S18 transfer case fluid capacity ranges from 4,5 to 6 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
10S18 4x4 (1988-1996)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200
12S18 4x4 (1988-1996)
  • Use: Normal
  • Capacity 4,5 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200
15S18 4x4 (1988-1993)
  • Use: Normal
  • Capacity 6 liter
  • Check 20000 km
  • Change 40000 km/ 12 months
  • Code: VG 1200

Additional Notes

  • The 10S18 4x4 and 12S18 4x4 share an identical transfer case fluid capacity of 4.5 liters, while the 15S18 4x4 requires 6 liters, a difference of 1.5 liters that reflects the larger transfer case unit fitted to that configuration.
  • All three Steyr S18 4x4 configurations follow the same check interval of 20,000 km, regardless of the capacity difference between the smaller and larger transfer case units.
  • The change interval across all three configurations is set at 40,000 km or 12 months under normal use conditions, meaning whichever threshold is reached first triggers the service requirement.
  • The 15S18 4x4 carries a narrower production window of 1988-1993, compared to the 1988-1996 range of the 10S18 4x4 and 12S18 4x4, which means the 6-liter capacity specification applies only within that earlier period.
  • A 4.5-liter transfer case fill is a substantial fluid volume, consistent with a heavy-duty commercial or agricultural vehicle transfer box rather than a light passenger 4x4 unit, where transfer case capacities are typically well under 2 liters.
  • The 6-liter capacity of the 15S18 4x4 transfer case places it firmly in the range of large commercial-grade drivetrain components, where higher fluid volumes support greater thermal management and lubrication demands under load.

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