Mercedes-Benz SLC-Class, R172 (USA / CAN)

Automatic transmission fluid capacity & service interval

Mercedes-Benz SLC-Class, R172 (USA / CAN) requires automatic transmission fluid with a capacity range of 9 to 10 liters. The service interval for fluid changes is 77500 miles. The data covers 2 configurations.

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

TypeSpecifications
SLC 300, 172.438 (2016-2020)
  • Use: Normal
  • Capacity 10 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1
SLC 43 AMG, 172.466 (2016-2020)
  • Use: Normal
  • Capacity 9 liter
  • Change 77500 miles
  • Code: 722.9xx 7/1

Additional Notes

  • The SLC 300 (172.438) carries a 10-liter automatic transmission fluid capacity, while the SLC 43 AMG (172.466) holds 9 liters, a one-liter difference between the two configurations across the 2016-2020 model years.
  • A 10-liter fill on the SLC 300 is consistent with a full service or overhaul-level quantity, as automatic transmissions typically hold between 8 and 12 liters when the torque converter and all internal passages are included in the fill.
  • The 9-liter capacity on the SLC 43 AMG similarly reflects a total system fill rather than a partial drain-and-fill, which would ordinarily recover only a fraction of the total fluid volume.
  • Both the SLC 300 and SLC 43 AMG share an identical change interval of 77,500 miles under normal use conditions, meaning the interval applies to standard driving rather than elevated-stress or high-frequency service patterns.
  • The 77,500-mile interval is notably long by general automotive standards, which is characteristic of Mercedes-Benz sealed or semi-sealed automatic transmission designs that are engineered for extended fluid life under normal operating conditions.

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