You have no way of knowing that the Ford 6.7 you buy will be "trouble free as long as you do the maintenance". While the 6.7 Ford is likely a better engine than the 6.0 and maybe better than the 6.4, it has it's issues...and the repairs are very expensive if you are one of the unfortunate ones.
Ford is very stingy with warranty coverage. If you have a High Pressure Fuel Pump(HPFP)failure on this engine, the repair will exceed $10,000 and warranty coverage is highly unlikely...just google Ford 6.7 Ford HPFP problems...there are volumes written about the problem..."Blue KoolAid Rainsuit" on...
Regards
