Mercedes-Benz GLC-Class / Coupé, X254 / C254 (USA / CAN)

Coolant capacity & service interval

Mercedes-Benz GLC-Class / Coupé, X254 / C254 (USA / CAN) coolant capacity ranges from 3 to 15,2 liters. Service intervals require changes every 124000 miles or 120 months. The data covers 8 configurations.

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

TypeSpecifications
  • GLC 350 e 4MATIC, 254.156/356/656 (2023- )
  • Primary
  • Use: Normal
  • Capacity 15,2 liter
  • Change 124000 miles/ 120 months
  • GLC 350 e 4MATIC, 254.156/356/656 (2023- )
  • Secondary
  • Use: Normal
  • Capacity 7 liter
  • Change 124000 miles/ 120 months
  • GLC 43 AMG 4MATIC, 254.187/387/687 (2023- )
  • Primary
  • Use: Normal
  • Capacity 12,4 liter
  • Change 124000 miles/ 120 months
  • GLC 43 AMG 4MATIC, 254.187/387/687 (2023- )
  • Secondary
  • Use: Normal
  • Capacity 5,1 liter
  • Change 124000 miles/ 120 months
  • GLC 300, 254.146/346/646 (2022- )
  • Primary
  • Use: Normal
  • Capacity 14 liter
  • Change 124000 miles/ 120 months
  • GLC 300, 254.146/346/646 (2022- )
  • Secondary
  • Use: Normal
  • Capacity 3 liter
  • Change 124000 miles/ 120 months
  • GLC 300 4MATIC, 254.147/347/647 (2022- )
  • Primary
  • Use: Normal
  • Capacity 14 liter
  • Change 124000 miles/ 120 months
  • GLC 300 4MATIC, 254.147/347/647 (2022- )
  • Secondary
  • Use: Normal
  • Capacity 3 liter
  • Change 124000 miles/ 120 months

Additional Notes

  • The Mercedes-Benz GLC-Class / Coupé X254 / C254 coolant service interval is uniform across all listed configurations at 124,000 miles or 120 months under normal use conditions, which translates to a 10-year or roughly six-figure mileage replacement cycle.
  • Both the GLC 300 (254.146/346/646) and GLC 300 4MATIC (254.147/347/647) share identical coolant capacities, with 14 liters in the primary cooling system and 3 liters in the secondary cooling system, starting from 2022.
  • The presence of a secondary cooling circuit across all listed configurations indicates a multi-loop thermal management architecture, where separate coolant volumes serve distinct components such as the powertrain electronics or transmission.
  • The GLC 350 e 4MATIC (254.156/356/656), starting from 2023, carries a primary cooling system capacity of 15.2 liters, which is the largest primary circuit volume among all listed configurations.
  • The GLC 350 e 4MATIC secondary cooling system holds 7 liters, more than double the 3-liter secondary capacity of the GLC 300 variants, reflecting the additional thermal load associated with a plug-in hybrid drivetrain's high-voltage components.
  • The GLC 43 AMG 4MATIC (254.187/387/687), starting from 2023, has a primary cooling system capacity of 12.4 liters, which is the smallest primary circuit volume across all listed configurations despite being a performance-oriented variant.
  • The GLC 43 AMG 4MATIC secondary cooling system capacity is 5.1 liters, placing it between the GLC 300's 3-liter and the GLC 350 e 4MATIC's 7-liter secondary volumes.
  • All eight specification rows carry a normal use condition designation, meaning the 124,000-mile and 120-month intervals are not adjusted for severe operating environments in the listed data.

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