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

Automatic transmission fluid capacity & service interval

Mercedes-Benz GLC-Class / Coupé, X254 / C254 (USA / CAN) requires automatic transmission fluid with a capacity of 10 liter. The service interval for the fluid change is 77500 miles. The data covers 4 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- )
  • Use: Normal
  • Capacity 10 liter (Dry fill)
  • Change 77500 miles
  • Code: 725.181 9/1
GLC 43 AMG 4MATIC, 254.187/387/687 (2023- )
  • Use: Normal
  • Capacity 10 liter (Dry fill)
  • Change 77500 miles
  • Code: 725.1** 9/1
GLC 300, 254.146/346/646 (2022- )
  • Use: Normal
  • Capacity 10 liter (Dry fill)
  • Change 77500 miles
  • Code: 725.171 9/1
GLC 300 4MATIC, 254.147/347/647 (2022- )
  • Use: Normal
  • Capacity 10 liter (Dry fill)
  • Change 77500 miles
  • Code: 725.171 9/1

Additional Notes

  • Across all four configurations of the Mercedes-Benz GLC-Class / Coupé X254 / C254, the automatic transmission dry fill capacity is 10 liters. A dry fill figure represents the total fluid volume required when filling a completely drained or newly assembled transmission, as opposed to a partial service fill where residual fluid remains in the torque converter and passages.
  • The 10-liter dry fill capacity applies uniformly to the GLC 300, GLC 300 4MATIC, GLC 350 e 4MATIC, and GLC 43 AMG 4MATIC variants, meaning no configuration in the lineup calls for a greater or lesser total fluid volume at the transmission level.
  • The GLC 43 AMG 4MATIC, carrying AMG performance designation and chassis codes 254.187/387/687, shares the same 10-liter dry fill capacity and 77,500-mile change interval as the base GLC 300, despite representing a higher-output powertrain configuration.
  • The GLC 350 e 4MATIC, chassis codes 254.156/356/656, is a plug-in hybrid variant. Even with the added complexity of a hybrid drivetrain, the automatic transmission fluid capacity and service interval remain consistent with the non-hybrid configurations at 10 liters and 77,500 miles.
  • The 77,500-mile change interval listed for all configurations is designated for normal use conditions. Normal use typically refers to standard on-road driving without the elevated thermal and mechanical stress associated with severe duty cycles such as frequent towing, extreme temperatures, or stop-and-go fleet operation.
  • A 77,500-mile interval is relatively extended compared to many automatic transmission service schedules, which often fall in the 30,000-to-60,000-mile range. The specification reflects a sealed or long-life fluid design rather than a frequent-service approach.
  • Both rear-wheel-drive configurations (GLC 300, chassis 254.146/346/646) and all-wheel-drive 4MATIC configurations carry identical transmission fluid specifications, indicating the automatic transmission unit itself does not differ in fluid capacity or service timing based on drivetrain layout.

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