Cummins ISB G (Cummins Westport CNG)
Coolant capacity & service interval
Cummins ISB G (Cummins Westport CNG) coolant capacity is 11,8 liters. Service intervals appear at 6 months. Data covers 1 configuration.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| ISB 6.7 G GHG 17 (2016- ) |
|
Additional Notes
- The Cummins ISB G (Cummins Westport CNG) ISB 6.7 G GHG 17 carries a cooling system capacity of 11.8 liters, a figure consistent with the demands of a natural gas-fueled medium-duty engine where thermal management requirements are substantial.
- The 11.8-liter coolant capacity reflects a full cooling system fill, meaning the volume accounts for the entire circuit including the engine block, cylinder head passages, and associated plumbing rather than a partial or component-level service quantity.
- The specified check interval for the ISB 6.7 G GHG 17 cooling system is every 6 months under normal use conditions, placing coolant condition monitoring on a time-based schedule rather than a mileage or hour-based one.
- A 6-month check interval under normal use conditions means the coolant is inspected for concentration, pH, and contamination at that frequency, though the interval does not necessarily correspond to a full drain-and-fill service at each check.