Cummins ISX12 G (Cummins Westport CNG), GHG 14

Coolant capacity & service interval

Cummins ISX12 G (Cummins Westport CNG), GHG 14 uses coolant with a capacity of 25,1 liters. Service intervals include 300000 miles/ 6000 hours/ 24 months and 90000 miles/ 24 months/ 6 hours. The data covers 2 configurations.

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

TypeSpecifications
ISX12 G GHG 14 (2013- )
  • Use: Line haul
  • Capacity 25,1 liter
  • Change 300000 miles/ 6000 hours/ 24 months
ISX12 G GHG 14 (2013- )
  • Use: Refuse truck, urban truck
  • Capacity 25,1 liter
  • Change 90000 miles/ 24 months/ 6 hours

Additional Notes

  • The Cummins ISX12 G (Cummins Westport CNG) GHG 14 cooling system holds 25.1 liters across both use conditions listed in the specifications.
  • Under line haul conditions, the coolant change interval is 300,000 miles, 6,000 hours, or 24 months, whichever comes first.
  • Under refuse truck and urban truck conditions, the coolant change interval drops significantly to 90,000 miles, 24 months, or 6 hours.
  • The 6-hour interval tied to refuse truck and urban truck use reflects the stop-and-go, high-idle operating cycles common in those vocations, which accelerate coolant degradation relative to sustained highway operation.
  • The 300,000-mile line haul interval is notably extended, consistent with the lower thermal and contamination stress placed on coolant during continuous long-distance operation compared to frequent stop cycles.