Very strong and reliable engine. I put 203,000 miles on my 2006 before selling it in June 2012 and ordering the 2013. That was after running a 75 shot of nitrous
on it for 2 years and then pulling the nitrous and putting the Xcharger Xtreme supercharger on it at 90,000 miles.
One thing to watch for is the thermostat housing. It is plastic and will split, usually toward the back, and spray coolant under the intake manifold. Look for any signs of water there. It is an easy fix, but when it goes it usually gives you no prior warning.