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

Transfer case fluid capacity & service interval

Mercedes-Benz GLS-Class, X167 (USA / CAN) uses transfer case fluid with a capacity range of 0,65 to 0,68 liters. Service intervals occur every 31000 miles or 36 months. 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 0,65-0,68 liter
GLS 580 4MATIC, 167.985 (2023- )
  • Use: Normal
  • Capacity 0,65-0,68 liter
GLS 450 4MATIC (M256.930), 167.959 (2019- )
  • Use: Normal
  • Capacity 0,65-0,68 liter
GLS 580 4MATIC, 167.980 (2019-2023)
  • Use: Normal
  • Capacity 0,65-0,68 liter
GLS 63 S AMG 4MATIC+, 167.989 (2019- )
  • Use: Normal
  • Capacity 0,65-0,68 liter
  • Change 31000 miles/ 36 months
Maybach GLS 600 4MATIC, 167.987 (2019- )
  • Use: Normal
  • Capacity 0,65-0,68 liter
  • Change 31000 miles/ 36 months

Additional Notes

  • Across all six configurations of the Mercedes-Benz GLS-Class X167 listed here, the transfer case fluid capacity falls within a narrow range of 0.65 to 0.68 liter. A range rather than a single fixed value is typical for transfer case service fills, reflecting minor variation depending on the angle of the drain plug, residual fluid left in the unit, and the precision of the fill method used.
  • The 0.65-0.68 liter figure represents a service fill capacity, meaning the amount of fluid added during a routine drain-and-fill procedure. Transfer case service fills are generally lower than overhaul or dry-fill capacities, which account for a completely empty unit including all internal passages and the torque-sensing components.
  • The GLS 450 4MATIC with engine code M256.930 on body code 167.959 and the GLS 450 4MATIC+ with engine code M256.830 on the same body code share an identical transfer case fluid capacity of 0.65-0.68 liter, despite the M256.830 being a mild-hybrid variant of the inline-six engine family.
  • The GLS 580 4MATIC appears under two separate chassis codes: 167.980 covering 2019-2023, and 167.985 starting in 2023. Both carry the same 0.65-0.68 liter transfer case capacity, indicating the transfer case unit itself did not change between those two chassis designations.
  • A fluid change interval of 31,000 miles or 36 months under normal use conditions is specified for the GLS 63 S AMG 4MATIC+ (167.989) and the Maybach GLS 600 4MATIC (167.987). The remaining four configurations in the table carry no listed change interval, only a capacity figure.
  • The 36-month time limit paired with the 31,000-mile interval on the GLS 63 S AMG 4MATIC+ and Maybach GLS 600 4MATIC means fluid replacement is due at whichever threshold is reached first. Time-based limits exist because fluid degrades chemically regardless of mileage accumulation, particularly in low-use or short-trip driving patterns.
  • The GLS 63 S AMG 4MATIC+ uses a 4.0-liter twin-turbocharged V8 producing significantly higher torque loads than the inline-six engines in the GLS 450 variants. Despite the greater drivetrain stress associated with AMG performance tuning, the transfer case fluid capacity remains within the same 0.65-0.68 liter range shared across all X167 configurations listed.

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