I'm looking at buying a 2009 4.7 4x4 larado with 144k that has perfect carfax and service records .my question is how many miles can I expect out of this engine? I've researched this year and on edmunds it has the least complaint out of all years and grest reveiws.I used to drive a 05 5.7 overland and loved it.any advice or experience is appreciated.