 Any web search of the infamous Ford Diesel will let you know, its not if but when you will be spending a lot of bucks to rebuild the engine. Removal of the entire cab is necessary to gain entry to the engine. A defective EGR, Oil Cooler or over boosting Turbo Charger are all blamed for the head bolts stretching, and allowing the heads to left when the compression gets too great. The fix is spending $3,000 to $8,000 for new head gaskets, checking or replacing the heads, $1,000 to rebuild the Turbo. Replace the oil cooler and EGR, just in case. The 2008-2010 get terrible gas mileage and the 2011 needs a urea tank filled every 3,000 miles 