Unimog (MB) 427

Manual transmission fluid capacity & service interval

Unimog (MB) 427 manual transmission fluid capacity is 12 liters. Service intervals include checking every 800 hours and changing every 1600 hours or 12 months. The data covers 4 configurations.

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

TypeSpecifications
  • U 1600, U 1650, U 1650 L (427) (1992-2001)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8
  • U 1000, (427) (1988-2001)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8
  • U 1200, U 1250, U 1250 L (427) (1988-2001)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8
  • U 1400, U 1450 (427) (1988-2001)
  • Manual/P.T.O.
  • Use: Normal
  • Capacity 12 liter
  • Check 800 hours
  • Change 1600 hours/ 12 months
  • Code: 8/8

Additional Notes

  • Across all four variants covered in the Unimog (MB) 427 specifications — the U 1000, U 1200, U 1250, U 1250 L, U 1400, U 1450, U 1600, U 1650, and U 1650 L — the manual transmission and P.T.O. fluid capacity is uniformly listed at 12 liters.
  • A 12-liter fill figure for a manual transmission is notably large by conventional vehicle standards, which reflects the integrated power take-off (P.T.O.) unit sharing the same fluid circuit rather than a standalone gearbox alone.
  • The check interval for the manual transmission and P.T.O. fluid is specified at 800 hours across all listed variants, meaning fluid condition and level are to be inspected at that operating-hour threshold under normal use conditions.
  • The change interval is set at 1600 hours or 12 months, whichever comes first, under normal use conditions — placing the drain-and-refill point at exactly double the check interval in terms of operating hours.
  • The U 1000, U 1200, U 1250, U 1250 L, U 1400, and U 1450 variants share an identical specification entry covering the 1988-2001 model year range, while the U 1600, U 1650, and U 1650 L carry the same fluid capacity and service intervals but with a starting year of 1992.
  • Because service intervals are expressed in operating hours rather than distance, the 12-month calendar limit on fluid changes serves as a time-based ceiling independent of how many hours the transmission has accumulated during that period.

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