I just bought a 2020 cascadia with just under 500k miles. On my first trip with only 15,000lbs in the box, i cannot climb hills over 45mph.
Im not sure if this is a dpf problem or something to do with the turbo. This truck does not have a boost gauge.
Soot level shows good.
Also, truck eats coolant when climbing hills. If i drive on flat roads, coolant will not go low.
Any advice helps.