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

Coolant capacity & service interval

Mercedes-Benz GL-Class, X166 (USA / CAN) coolant capacity ranges from 11,5 to 12,9 liters. The service interval is 150000 miles or 180 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 11,5 liter
  • Change 150000 miles/ 180 months
GL 450 4MATIC, 166.872 (2011-2015)
  • Use: Normal
  • Capacity 12,9 liter
  • Change 150000 miles/ 180 months
GL 550 4MATIC, 166.873 (2011-2015)
  • Use: Normal
  • Capacity 12,9 liter
  • Change 150000 miles/ 180 months

Additional Notes

  • The GL 350 BlueTEC 4MATIC (166.824) carries a cooling system capacity of 11.5 liters, which is notably lower than the two gasoline variants in the same generation lineup.
  • Both the GL 450 4MATIC (166.872) and GL 550 4MATIC (166.873) share an identical cooling system capacity of 12.9 liters, despite being distinct engine configurations.
  • The 1.4-liter difference between the diesel and gasoline cooling system capacities reflects the differing thermal management demands and engine block dimensions between the diesel six-cylinder and the gasoline V8 powerplants.
  • All three configurations across the Mercedes-Benz GL-Class X166 (USA/CAN) carry the same coolant change interval of 150,000 miles or 180 months under normal use conditions, whichever comes first.
  • An interval of 180 months translates to 15 years, placing the GL-Class X166 coolant service among the longer-cycle schedules typical of modern extended-life coolant formulations.
  • The 150,000-mile mileage threshold applies uniformly across the diesel and both gasoline variants, with no differentiation based on engine type or displacement for the 2011-2015 model years.

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