Unimog (MB) 425

Manual transmission fluid capacity & service interval

Unimog (MB) 425 manual transmission fluid capacity is 12 liters. Service intervals include checking at 800 hours and changing at 1600 hours or 12 months. The data covers 2 configurations.

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

TypeSpecifications
  • U 1300, 1500 (425) (1982-1992)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8
  • U 1300 (425) (1976-1984)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8

Additional Notes

  • The manual transmission and power take-off unit on the Unimog (MB) 425 carries a fluid capacity of 12 liters, a figure consistent with a combined transmission and PTO housing rather than a standalone gearbox fill.
  • Both the U 1300 (1976-1984) and the U 1300, 1500 (1982-1992) configurations share an identical 12-liter capacity, indicating no volumetric difference between the two variants despite the span of model years covered.
  • The check interval is set at 800 hours across both configurations, meaning fluid level inspection falls due at roughly half the frequency of a full drain-and-fill service.
  • The change interval is specified at 1600 hours or 12 months, whichever comes first, applying a dual trigger that accounts for both operational use and calendar-based fluid degradation.
  • Both rows carry a Normal use condition designation, meaning the 1600-hour or 12-month change interval reflects standard operating demands rather than a reduced interval tied to severe-duty cycles.
  • The service intervals are expressed in engine or operational hours rather than distance, which reflects the Unimog 425 platform's role as a work vehicle where odometer mileage is not a reliable measure of drivetrain stress.

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