GMC Sierra, GMT K2CG/EG/HG/RG (USA / CAN)

Automatic transmission fluid capacity & service interval

GMC Sierra, GMT K2CG/EG/HG/RG (USA / CAN) requires automatic transmission fluid with a capacity of 7 liters. Service intervals include changes at 45000 miles and 97500 miles. The data covers 6 configurations.

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

TypeSpecifications
Sierra 6.6 Duramax V8 DPF (332 kW) (2016-2019)
  • Use: Normal
  • Capacity 7 liter
  • Change 97500 miles
  • Code: Allison MW7 6/1
Sierra 6.6 Duramax V8 DPF (332 kW) (2016-2019)
  • Use: Severe
  • Capacity 7 liter
  • Change 45000 miles
  • Code: Allison MW7 6/1
Sierra 6.6 Duramax V8 DPF (291 kW) (2015-2016)
  • Use: Normal
  • Capacity 7 liter
  • Change 97500 miles
  • Code: Allison MW7 6/1
Sierra 6.6 Duramax V8 DPF (291 kW) (2015-2016)
  • Use: Severe
  • Capacity 7 liter
  • Change 45000 miles
  • Code: Allison MW7 6/1
Sierra 6.6 V8 DPF (291 kW) (2014-2015)
  • Use: Normal
  • Capacity 7 liter
  • Change 97500 miles
  • Code: Allison MW7 6/1
Sierra 6.6 V8 DPF (291 kW) (2014-2015)
  • Use: Severe
  • Capacity 7 liter
  • Change 45000 miles
  • Code: Allison MW7 6/1

Additional Notes

  • The GMC Sierra GMT K2CG/EG/HG/RG automatic transmission fluid capacity is 7 liters across all six listed configurations, covering the 6.6 V8 DPF (291 kW) from 2014-2015, the 6.6 Duramax V8 DPF (291 kW) from 2015-2016, and the 6.6 Duramax V8 DPF (332 kW) from 2016-2019.
  • A 7-liter service fill is consistent with a fluid drain-and-fill procedure rather than a full overhaul refill, which on many automatic transmissions would require a notably higher volume to account for fluid retained in the torque converter and passages.
  • Under normal use conditions, all three engine configurations share a 97,500-mile automatic transmission fluid change interval, regardless of output rating or model year within the 2014-2019 span.
  • Under severe use conditions, the change interval drops to 45,000 miles across all listed configurations, representing a reduction of more than half compared to the normal-use interval of 97,500 miles.
  • The 291 kW output rating appears across two distinct model year ranges: the 6.6 V8 DPF covering 2014-2015 and the 6.6 Duramax V8 DPF covering 2015-2016, with both sharing identical capacity and interval figures for both use conditions.
  • The 6.6 Duramax V8 DPF at 332 kW, covering 2016-2019, carries the same 7-liter capacity and the same 97,500-mile normal and 45,000-mile severe intervals as the lower-output 291 kW variants, indicating no transmission service differentiation tied to the higher power output.

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