The engine in my 2012 Expedition failed with only 33,000 miles. All maintenance has been done. Found tar like substance in oil pan and clogging oil pick up. Seems like it got really hot to turn oil into this tar like charcoal but never had a light come on or guage read hot. Undiagnosed so far. Anyone else out there had this issue? Trying to figure out what would cause this? help please