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The engine is reliable, all the stuff around it a bit less so. A quick (non exhaustive) list of stuff to be extra cautious about.
Turbos (over 100k miles on stock and it tends to be a matter of time). Look for wastegate rattle and play (or smoking of course).
Fuel pumps (high pressure and low pressure). This can be logged at WOT keeping an eye on low pressure and high pressure fuel rails.
Injectors (check sparkplugs for fuel when vehicle cold, look for misfiring or running rough).
Water pump/Tstat, if it hasn't gone yet, it likely will at some point.
Valve cover/gasket, look for seepage, this likely has to be done at some point.
Oil pan gasket, look for leaking.
Oil filter housing gasket, look for leaking.
Window regulators (just make sure all the windows work).
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