Unimog (MB) 403, 406, 413, 416

Manual transmission fluid capacity & service interval

Unimog (MB) 403, 406, 413, 416 models require 6 liters of manual transmission fluid. Service intervals include checking every 800 hours and changing every 1600 hours 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
U 900 (406), U 1100 (416) (1985-1992)
  • Use: Normal
  • Capacity 6 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 20/8
U 800 (403), U 800L (413) (1970-1992)
  • Use: Normal
  • Capacity 6 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 20/8
U 900 (406), U 1100 (416) (1970-1992)
  • Use: Normal
  • Capacity 6 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 20/8

Additional Notes

  • The Unimog 403, 406, 413, and 416 manual transmissions share a uniform 6-liter fluid capacity across all listed configurations from 1970-1992, indicating a consistent gearbox design across these model variants.
  • A 6-liter capacity in a manual transmission of this class is a substantial fill volume, reflecting the heavy-duty, multi-range gearbox architecture typical of commercial utility vehicles rather than a light passenger car unit.
  • The check interval is set at 800 hours across all configurations, meaning fluid level verification is due at roughly half the frequency of a full drain-and-fill service.
  • The change interval is specified as 1600 hours or 12 months, whichever comes first, under normal use conditions. The hour-based figure acknowledges that Unimog vehicles accumulate operating time in ways that do not always correlate directly with calendar months.
  • The U 900 (406) and U 1100 (416) appear in two separate row entries: one covering 1970-1992 and another covering 1985-1992. Both entries carry identical capacity and interval specifications, indicating no revision to the fluid service requirements was introduced for the later production period.
  • The U 800 (403) and U 800L (413) share a single combined entry spanning 1970-1992, with the same 6-liter capacity and 1600-hour/12-month change interval as the higher-designation models in the lineup.

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