It depends on many aspects (car usage, quality, etc.) I recently bought a used diesel car (10 years old, 150k KM), the DPF was almost dead. Needless to say that

It depends on many aspects (car usage, quality, etc.) I recently bought a used diesel car (10 years old, 150k KM), the DPF was almost dead. Needless to say that is wasn't a pleasant surprise... Edit: Also the DPF is not the catalytic converter, these are two different elements.