DPF regen

Carbon ash trapped in DPF just burns out with high temperature during the parked regeneration. If temperature not enough high or exhaust leaking the DPF will accumulate the ash and clog.

 

The DPF collects the soot, or unburn fuel left over from combustion. During a regen the extra high temps finish this burn to bake off that soot. A fair portion is cleanly converted into heat and the rest burns down into ash. Think of a particle of soot as being the size of a beach ball. After it is baked down the ash would only be the size of small marble. This ash will remain inside the DPF, so yes, there does come a time when the DPF has to be removed and cleaned out.

 

They are cleaned by high temperature baking and high pressure washing and I've even heard of using lasers.

The baking process is similar to what is going on in a regen

Except now they are finding the baking process further breaks down the metal making it brittle so now they are leaning towards replacing it instead of cleaning

More money out of truck owners pockets