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[2x6 Bulldog]

Your engine warranty is 5 years or 100,000 miles whichever comes first. If your only driving a few miles at a time and not regenerating the DPF you will have problems with the DPF and the emission controls probably other engine problems as well. Diesels were designed to work hard. It doesn't sound like you are getting the engine even warm. This is not good for any engine even a gasser. I'd would get a Spartan tuner

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and try get that truck hot and working.