I have a Prius Plug-in 2014…
I have a Prius Plug-in 2014 with about 73K miles (engine+transmission replaced at about 108K or 112K miles, Headgasket replaced at 212K or 208K miles, going strong ~ 340k miles now) and Prius V 2013 with about 173K miles (started engine rattle about 10K later, replaced ignition coils from junkyard, went OK for a few 1000 miles before rattling again).
Pulled the engine for the V at 187350 miles, and teared it down, replaced rings and pistons and head gasket from dealer. Only driven it a few hundred miles. So far, so good. Plan on changing engine oil at 500,1000 and once more before defaulting to 5k intervals.