Ford is telling me that I have a plugged EGR cooler and oil cooler. My Excursion was running good except in this cold weather, it would smoke and hesitate so I took it in to check it out. 4,500.00 to fix it. I thought that changing the oil Mobil 1, air, and fuel filters and my diesel would keep running well forever. I guess I should have changed the EGR valve sooner.