Unimog (MB) 408, 418

Coolant capacity & service interval

Unimog (MB) 408 and 418 models require coolant with a capacity range of 11 to 20 liters. The service interval for coolant replacement is 36 months. The data covers 3 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 20 liter
  • Change 36 months
U 140 (418) (1992-2000)
  • Use: Normal
  • Capacity 20 liter
  • Change 36 months
U 90 (408) (1992-2000)
  • Use: Normal
  • Capacity 11 liter
  • Change 36 months

Additional Notes

  • The U 110 (418) and U 140 (418) share an identical cooling system capacity of 20 liters, while the U 90 (408) holds 11 liters, reflecting the smaller engine displacement of the 408 series relative to the 418.
  • The Unimog (MB) 408 and 418 models from 1992-2000 all carry a 36-month coolant change interval under normal use conditions, meaning standard operating environments without the added thermal or contamination stress that would otherwise shorten service cycles.
  • The 9-liter difference in cooling system capacity between the U 90 (408) at 11 liters and the 418-series variants at 20 liters is a meaningful distinction for service planning, as a larger system volume generally requires more coolant concentrate and longer flush procedures during a change.
  • The 20-liter cooling system capacity on both the U 110 and U 140 (418) models indicates a service fill specification, representing the total volume of the cooling circuit rather than a partial top-up quantity.
  • A 36-month change interval is a time-based service trigger, meaning coolant replacement on all three configurations is due at three years regardless of mileage or hours accumulated during that period under normal use.

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