Unimog (MB) 408, 418

Power steering fluid capacity & service interval

Unimog (MB) 408 and 418 models utilize power steering fluid with a capacity range of 0,6 to 3 liters. Service intervals require changes every 2400 hours or 24 months. The data covers 6 configurations.

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

TypeSpecifications
U 110 (418) (1992-2000)
  • Use: Normal
  • Capacity 3 liter
  • Change 2400 hours/ 24 months
U 110 (418) (1992-2000)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 2400 hours/ 24 months
U 140 (418) (1992-2000)
  • Use: Normal
  • Capacity 3 liter
  • Change 2400 hours/ 24 months
U 140 (418) (1992-2000)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 2400 hours/ 24 months
U 90 (408) (1992-2000)
  • Use: Normal
  • Capacity 2,5 liter
  • Change 2400 hours/ 24 months
U 90 (408) (1992-2000)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 2400 hours/ 24 months

Additional Notes

  • The Unimog 418 series, covering the U 110 and U 140 variants from 1992-2000, shares an identical power steering fluid capacity of 3 liters, while the 408 series U 90 from the same period carries a slightly lower capacity of 2.5 liters.
  • The steering box capacity is uniform across all three variants — U 90 (408), U 110 (418), and U 140 (418) — at 0.6 liters, indicating a consistent steering box design regardless of model series.
  • All six configurations across both the 408 and 418 series specify a change interval of 2400 hours or 24 months under normal use conditions, whichever comes first, applying equally to both the power steering and steering box circuits.
  • The dual-format interval of 2400 hours and 24 months reflects the working-hour-based service logic common to commercial and utility vehicles, where calendar time and operational hours are tracked in parallel rather than relying on odometer readings alone.
  • The power steering system and the steering box are serviced as separate fluid circuits on all listed variants, each with its own defined capacity, meaning a full steering service on any of the 1992-2000 models involves two distinct fill volumes rather than a single unified reservoir.
  • On the U 110 and U 140 (418) models, the combined fluid volume for a full steering service totals 3.6 liters — 3 liters for the power steering circuit and 0.6 liters for the steering box — while the U 90 (408) totals 3.1 liters under the same calculation.

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