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I used to work as a tractor trailer mechanic and still working in the trucking industry. The bill comes due when you're dealing with the aftertreatment system. Once enough ash builds up in there, it has to be replaced or cleaned, depending on what that DPF calls for. There's no magic trick to get out of this if it's already getting full. If there was, I promise that trucking companies would be doing it to save money.
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