I recently quoted a new Pettibone 204 Tier 4 pipe handler to a customer. I was told by Pettibone that the DEF system CANNOT be run out of fluid...…………...if so, the Cummins people have to come out and plug in their computer to get the machine to run again. Does this make sense to anyone? What is aggravating me is the new machine has a super small DEF tank, and they are telling me it will need topped off every 1.5-2 tank fill ups. I'm not that familiar with the DEF systems on most other equipment, but does this seem normal? I have a new 2018 Dodge truck with the Cummins and no one said anything of the sort...……..although Im getting 5-7 tanks of diesel per 5 gallon fill up on DEF.