Mercedes-Benz GLS-Class, X167 (USA / CAN)

Automatic transmission fluid capacity & service interval

Mercedes-Benz GLS-Class, X167 (USA / CAN) requires automatic transmission fluid with a capacity of 10-11 liters. The service interval for fluid changes is 77500 miles. The data covers 6 configurations.

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

TypeSpecifications
GLS 450 4MATIC+ (M256.830), 167.959 (2023- )
  • Use: Normal
  • Capacity 10-11 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1
GLS 580 4MATIC, 167.985 (2023- )
  • Use: Normal
  • Capacity 10-11 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1
GLS 450 4MATIC (M256.930), 167.959 (2019- )
  • Use: Normal
  • Capacity 10-11 liter (Dry fill)
  • Change 77500 miles
  • Code: 725.0xx 9/1
GLS 580 4MATIC, 167.980 (2019-2023)
  • Use: Normal
  • Capacity 10-11 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1
GLS 63 S AMG 4MATIC+, 167.989 (2019- )
  • Use: Normal
  • Capacity 10-11 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1
Maybach GLS 600 4MATIC, 167.987 (2019- )
  • Use: Normal
  • Capacity 10-11 liter
  • Change 77500 miles
  • Code: 725.0xx 9/1

Additional Notes

  • Across all X167 configurations listed — the GLS 450 4MATIC, GLS 450 4MATIC+, GLS 580 4MATIC, GLS 63 S AMG 4MATIC+, and Maybach GLS 600 4MATIC — the automatic transmission fluid capacity is specified at 10-11 liters, indicating a range rather than a fixed single value.
  • The GLS 450 4MATIC with engine code M256.930 carries a dry fill designation on its 10-11 liter capacity figure. A dry fill represents the total fluid volume required when filling a completely drained or newly assembled transmission, as opposed to a service fill, which accounts for residual fluid remaining after a drain.
  • The remaining configurations — including the GLS 450 4MATIC+ (M256.830), both GLS 580 4MATIC variants, the GLS 63 S AMG 4MATIC+, and the Maybach GLS 600 4MATIC — list the same 10-11 liter capacity without a dry fill qualifier, which corresponds to a standard service fill volume.
  • All six configurations share an identical fluid change interval of 77,500 miles under normal use conditions. Normal use, as a service classification, generally refers to everyday driving patterns that fall outside of more demanding operating environments such as frequent towing, extreme temperatures, or stop-and-go urban cycles.
  • The GLS 580 4MATIC appears under two separate chassis codes: 167.980 for the 2019-2023 period and 167.985 from 2023 onward. Despite the chassis code change, both variants retain the same 10-11 liter capacity and 77,500-mile service interval under normal use.
  • The Mercedes-Benz GLS 63 S AMG 4MATIC+ (167.989) shares the same 10-11 liter fluid capacity and 77,500-mile change interval as the non-AMG variants in the X167 lineup, despite the performance-oriented nature of the AMG powertrain configuration.

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