Irisbus CityClass
Differential fluid capacity & service interval
Irisbus CityClass differential fluid specifications cover a fluid capacity of 25 liters. The data includes two configurations for this model.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
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Additional Notes
- Both the Irisbus CityClass 491.10.22 and 491.12.22 share an identical rear differential fluid capacity of 25 liters, which is a notably large fill volume consistent with heavy-duty axle assemblies found in full-size urban transit buses.
- A 25-liter rear differential capacity falls well above the range typical of light commercial vehicles, reflecting the scale of the drive axle hardware required to handle the load and stop-start demands of city bus operation.
- The capacity figure listed for both configurations applies under normal use conditions, meaning the 25-liter specification is associated with standard service rather than a severe-duty or first-change interval.
- Coverage for both the 491.10.22 and 491.12.22 variants spans 1995-2006, and the rear differential fluid capacity remains consistent at 25 liters across that entire model year range for each variant.