I just picked my '06 f-250 with 87000 up from dealer Friday . It had the same problem EGR cooler went out . Dealer explained that when the temps. differ more than 15 degrees it causes the EGR cooler to fail .This was caused by the oil cooler being plugged . However they didn't tell me what caused the oil cooler to plug . They changed oil cooler EGR cooler . Seems to be fine now . the power is back and it stopped blowing the white cloud out of the exhaust for now , I hope the factory parts will suffice the $2300 price tag scares me as I only have 13000 left on the warranty .