Can anyone offer insight into this? I have the GDE tune and my truck ran two regens within 100 miles the other day. I'm in Iowa and it's been below 30 degrees for the week. If I don't get the truck up to operating temperature on every drive, will the colder temperatures cause a quick build-up of soot? I noticed this last year as well - prior to the GDE tune - and this eventually led to the failure of the EGR cooler. Maybe this was a fluke, but I just wanted to see if anyone else has experienced anything similar. Maybe I just need to make sure that I'm getting the truck up to operating temps on every trip.