 I have about 86000 miles on my 2013 F-150 with Ecoboost.  I was pretty happy with the truck, changed oil regularly, and always have properly serviced.  Ford's warranty is no good, even with an extended warranty it would have only been for 60000 miles.  I was driving down the road and the engine quit.  The Ford service has told me that the #6 piston is missing and two other pistons are very damaged.  The head has a whole in it from the damage.  There was no indication that the engine was failing.  It will cost me $9,000-$10,000 for a new engine and I am still paying on this truck.