I have a 2004 F250 SD. I purchased it with 93,000 miles on it and now have 104,000 on it. I have begun to have problems with it. I noticed about a month ago that my heat wasn't blowing real hot. I added a gallon of anti-freeze and that restored it. I just thought it was low. A week ago it started blowing smoke. I made a short highway trip and upon exiting I lost all throttle response for a few miles. The only response I had was when pressed completely to the floor. That to went away. Now the smoke is continueous and as of today I again had to add a gallon of anti-freeze. Now I have oil running out of the drain hole in the exhaust pipe. The truck has no modifications. Anybody have any answers? I want to be informed prior to going to the dealor. Help please.