Mercedes-Benz GL-Class, X166 (USA / CAN)

Automatic transmission fluid capacity & service interval

Mercedes-Benz GL-Class, X166 (USA / CAN) requires Automatic transmission fluid with a capacity of 9 liter. The service interval is 70000 miles or 84 months. The data covers 3 configurations.

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

TypeSpecifications
GL 350 BlueTEC 4MATIC, 166.824 (2011-2015)
  • Use: Normal
  • Capacity 9 liter (Dry fill)
  • Change 70000 miles/ 84 months
  • Code: 722.9xx 7/1
GL 450 4MATIC, 166.872 (2011-2015)
  • Use: Normal
  • Capacity 9 liter (Dry fill)
  • Change 70000 miles/ 84 months
  • Code: 722.9xx 7/1
GL 550 4MATIC, 166.873 (2011-2015)
  • Use: Normal
  • Capacity 9 liter (Dry fill)
  • Change 70000 miles/ 84 months
  • Code: 722.9xx 7/1

Additional Notes

  • A dry fill capacity of 9 liters applies to the automatic transmission across the GL 350 BlueTEC 4MATIC (166.824), GL 450 4MATIC (166.872), and GL 550 4MATIC (166.873) for the 2011-2015 model years.
  • A dry fill figure represents the total fluid volume required when filling a completely drained or rebuilt transmission, as opposed to a service fill, which accounts for residual fluid remaining after a standard drain procedure.
  • The 9-liter dry fill capacity is consistent across all three configurations despite differences in engine displacement and type, spanning a diesel inline-six in the GL 350 BlueTEC and gasoline V8 engines in the GL 450 and GL 550.
  • The normal use service interval for automatic transmission fluid across all three variants is set at 70,000 miles or 84 months, whichever comes first, reflecting a time-and-distance dual threshold common in manufacturer-specified maintenance schedules.
  • An 84-month time limit alongside the 70,000-mile mileage threshold means that lower-mileage vehicles still reach a mandatory fluid change point after seven years under normal use conditions.

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