have a 2000 f350 super duty I us to tow my 40' enclosed trailer never really had mechanical issues only use on average once a month, over weekend coming to stop light truck died and would not refire changed fuel filter, finally got to refire with starting fluid and get out of the roadway. about 10 miles down road truck started loosing power and running rough pulled over truck died would not refire again. using rag soaked in gas got truck to refire and got to better location. checking over turbo has some oil around bottom and noticed it smells like its burning oil and using oil now?? truck runs fine powerwise with trailer not connected any ideas??