Not that I have one (Tier 4 engine), because I don't, but I was under the understanding that when the DPF canister became full / plugged with burned soot, that the engine threw a warning light and derated (like JD's do).
So, I'm understanding it never derated and it never threw a code or light?
Sure am glad I don't own one.
Like I said, I know JD's derate and throw a code / light. My buddy down the road has a few.
Gee, every owner of a Tier 4 DPF equipped engine has that to look forward to. Not that most will be original owners but somewhere along the line, some owner will be on the hook.