Mercedes-Benz Citan, 420 (EU)

Coolant capacity & service interval

Mercedes-Benz Citan, 420 (EU) coolant capacity ranges from 7,2 to 10 liters. Service intervals require a change every 150000 km or 48 months. The data covers 5 configurations.

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

TypeSpecifications
Citan 108 CDI, 420.613/713 (2021- )
  • Use: Normal
  • Capacity 10 liter
  • Change 150000 km/ 48 months
Citan 110, 420.653/753 (2021- )
  • Use: Normal
  • Capacity 7,2 liter
  • Change 150000 km/ 48 months
Citan 110 CDI, 420.623/723 (2021- )
  • Use: Normal
  • Capacity 10 liter
  • Change 150000 km/ 48 months
Citan 112 CDI, 420.633/733 (2021- )
  • Use: Normal
  • Capacity 10 liter
  • Change 150000 km/ 48 months
Citan 113, 420.663/763 (2021- )
  • Use: Normal
  • Capacity 7,2 liter
  • Change 150000 km/ 48 months

Additional Notes

  • The Mercedes-Benz Citan 420 (EU) coolant system splits into two distinct capacity groups across the available variants: diesel-engined CDI models hold 10 liters, while petrol-engined variants — the 110 (420.653/753) and 113 (420.663/763) — hold 7.2 liters.
  • The 2.8-liter difference between the CDI and petrol cooling system capacities reflects the generally larger and more thermally demanding nature of diesel powertrains, which typically require greater coolant volume to manage combustion heat effectively.
  • All five variants share an identical service interval of 150,000 km or 48 months under normal use conditions, whichever comes first. The dual-criterion interval means the time limit of four years applies regardless of mileage accumulation.
  • The three CDI variants — Citan 108 CDI (420.613/713), 110 CDI (420.623/723), and 112 CDI (420.633/733) — all carry the same 10-liter cooling system capacity despite differing in power output, suggesting a shared engine block architecture with a common cooling circuit design.
  • A 150,000 km coolant change interval is relatively long by general automotive standards, which historically ranged from 30,000 to 60,000 km. Extended intervals of this length are associated with modern long-life coolant formulations that resist silicate depletion and corrosion inhibitor breakdown over greater distances.
  • The 48-month time-based limit on coolant changes reflects the chemical degradation of corrosion inhibitors over time, which occurs independently of vehicle operation. Coolant left in a system beyond this period may lose its protective properties even at low mileage.

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