What mileage/Hours to Change DEF Canister?

Clomax

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What mileage/Hours to Change D.P.F Filter?

My 2012 seems to be choked down lately.
What mileage is it recommended to change out the D.P.F* Filter?

Can't remove it since I'm in Ca and it's a company truck.

Thanks!
 
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sootie

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When it fails to clean during Regen . Like it is in constant Regen
 
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