Unimog (MB) 421

Differential fluid capacity & service interval

Unimog (MB) 421 differential fluid capacity is 2,5 liters. Service intervals occur 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 600, U 600 L (421) (1970-1992)
  • Front
  • Use: Normal
  • Capacity 2,5 liter
  • Change 1600 hours/ 12 months
  • U 600, U 600 L (421) (1970-1992)
  • Rear
  • Use: Normal
  • Capacity 2,5 liter
  • Change 1600 hours/ 12 months

Additional Notes

  • The front and rear differentials on the Unimog (MB) 421 each hold 2.5 liters of fluid, meaning a complete differential service across both axles requires 5 liters in total.
  • Both the front and rear differential service intervals are rated at 1,600 hours or 12 months under normal use conditions, whichever comes first, reflecting a time-and-hours dual-trigger approach common in heavy-duty vehicle maintenance schedules.
  • The 1,600-hour threshold is an engine or operational hours figure rather than a mileage figure, which is typical for work vehicles like the U 600 and U 600 L where annual distance traveled may vary considerably depending on application.
  • The identical 2.5-liter capacity and identical change interval for both the front and rear differentials on the U 600 and U 600 L indicate a symmetrical axle design across the 1970-1992 production span covered by these specifications.

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