I looking to upgrade to a Super Duty, I trying to find an 08 or 09 with low miles and was just wondering is there anything I should stay away from in regards to certain engines either gas or diesel?

 

If you want a diesel, the 6.4 is pretty decent, a LOT better than the 6.0 but the fuel mileage isn't that great. The V-10 gasser is a great engine but gets terrible gas mileage. The 5.4 is underpowered if you tow and doesn't get that great gas mileage either.