Are the intervals between belt changes longer due to the new type of belt, e.g. CT 1028 instead of CT 1021?
Intervals specified by the vehicle manufacturer must always be complied with. If the vehicle manufacturer increases the interval between belt changes due to a new type of belt, and this change is also valid retrospectively for older vehicle models, the km increase can also be applied in the case of the corresponding CT belts (check OEM number!).