I just picked up my first diesel truck. I lost my job (and a company truck with it) last month and needed something “affordable” as a stop-gap. I purchased it from a mutual friend. I know it has been maintained with an open checkbook. The Turbo was replaced recently and the FICM was replaced at the same time. EGR has been deleted. It runs great.... however, as I wrote the check, the seller says “just keep an eye on the temp guage, and keep a couple gallons of distilled water in the backseat.. it evaporates ever since the EGR delete” I drove it 3 hours down the interstate right after I purchased it with no issues. I get to my destination; park, go inside and ask my wife to come outside to check it out. She instantly asks to take it around the block. So she gets in and starts driving around the neighborhood (low speed) and we get a warning about the temperature. We get back to the house, I let it cool down and added 2 gallons of distilled water. How often is this going to happen? This is going to be a pain in the ass if so. What can I do to fix it so I don’t have to constantly add water?