New to the forum. I own a 2007 3500SLT Quad cab Dullie 5.9 with 260k on the clock. Love the truck! 8 years I took it to a guy they call The Diesel Doctor out in farm land in Indiana. Him and his son run the place, the father was an Engineer at Cummins in Columbus In. It's said that he designed the 5.9 motor. I have forgotten how to contact him or his son to get my rig serviced. Does anyone have that info and are willing to share it with me. Thanks!!