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don't think that buying a 6.7 will solve your issues. I have a 2015 that regens all the time. and so far I've had to have the def container cleaned out because of it being 'dirty'.
just use 'manual' and run your truck once a week at 2000rpm, 3rd gear for about 20 minutes...that may help.
I will probably go back to GMC on my next truck.
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