Mazda 6, GH/GZ (USA / CAN)

Coolant capacity & service interval

Mazda 6, GH/GZ (USA / CAN) models require coolant with a capacity range of 7,6 to 9,8 liters. Service intervals for fluid changes are 60000 miles or 60 months and 120000 miles or 120 months. The data covers 12 configurations.

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

TypeSpecifications
6 2.5 (CAN) (2010-2013)
  • Use: Normal
  • Capacity 7,6-9,4 liter
  • Change 60000 miles/ 60 months
6 2.5 (CAN) (2010-2013)
  • Use: Initial service
  • Capacity 7,6-9,4 liter
  • Change 120000 miles/ 120 months
6 2.5 (USA) (2010-2013)
  • Use: Normal
  • Capacity 7,6-9,4 liter
  • Change 60000 miles/ 60 months
6 2.5 (USA) (2010-2013)
  • Use: Initial service
  • Capacity 7,6-9,4 liter
  • Change 120000 miles/ 120 months
6 2.5 (CAN) (2008-2010)
  • Use: Normal
  • Capacity 9,4 liter
  • Change 60000 miles/ 60 months
6 2.5 (CAN) (2008-2010)
  • Use: Initial service
  • Capacity 9,4 liter
  • Change 120000 miles/ 120 months
6 2.5 (USA) (2008-2010)
  • Use: Normal
  • Capacity 9,4 liter
  • Change 60000 miles/ 60 months
6 2.5 (USA) (2008-2010)
  • Use: Initial service
  • Capacity 9,4 liter
  • Change 120000 miles/ 120 months
6 3.7 (CAN) (2008-2013)
  • Use: Normal
  • Capacity 8,9-9,8 liter
  • Change 60000 miles/ 60 months
6 3.7 (CAN) (2008-2013)
  • Use: Initial service
  • Capacity 8,9-9,8 liter
  • Change 120000 miles/ 120 months
6 3.7 (USA) (2008-2013)
  • Use: Normal
  • Capacity 8,9-9,8 liter
  • Change 60000 miles/ 60 months
6 3.7 (USA) (2008-2013)
  • Use: Initial service
  • Capacity 8,9-9,8 liter
  • Change 120000 miles/ 120 months

Additional Notes

  • Across all configurations, the Mazda 6 GH/GZ cooling system uses a two-tier service interval structure. The normal use interval is 60,000 miles or 60 months, while the initial service interval extends to 120,000 miles or 120 months. The initial service designation refers to the factory-fill coolant, which is formulated to last longer before the first drain and refill is required.
  • The 2.5-liter engine in 2008-2010 model years carries a fixed cooling system capacity of 9.4 liters for both USA and CAN market variants. A fixed single value at this level reflects a fully filled system with no noted variation between trim or configuration differences within that production period.
  • For the 2.5-liter engine covering 2010-2013, the cooling system capacity shifts to a range of 7.6 to 9.4 liters, applicable to both USA and CAN markets. A capacity range of this width typically indicates variation between body styles, transmission types, or optional equipment that affects coolant circuit volume.
  • The 3.7-liter engine across 2008-2013 carries a cooling system capacity range of 8.9 to 9.8 liters, again consistent across both USA and CAN markets. The higher baseline of 8.9 liters compared to the 2.5-liter configurations reflects the larger displacement engine's greater thermal load and correspondingly larger coolant circuit.
  • The 3.7-liter capacity range of 8.9 to 9.8 liters is narrower in spread than the 2.5-liter 2010-2013 range of 7.6 to 9.4 liters. A narrower range across a larger engine family suggests less variation in cooling circuit architecture between configurations equipped with the 3.7-liter unit.
  • The service intervals are expressed in both distance and time, with whichever limit is reached first serving as the trigger for service. The 60-month time limit on normal use intervals means that low-mileage vehicles still require coolant replacement after five years regardless of distance traveled, as coolant degrades chemically over time independent of use.
  • Both the USA and CAN market specifications for each engine and model year period are identical in capacity and interval values. No market-specific deviation appears in any of the listed configurations, indicating a unified coolant specification across North American markets for the Mazda 6 GH/GZ.

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