Looking to buy a 2015 Prius Four w 144k miles - what to look for in pre-inspection

make sure it isn't burning oil, and check the egr circuit for clogging. pray it doesn't already have a blown head gasket with sealant added to the coolant to try to fool you.
and be ready for a potential brake actuator failure

 

You can’t do a test drive and know it’s burning oil in an hour drive cycle.

 

Once you purchase it, save an additional $5,000 aside for upcoming repairs because saving gas cost a lot of money.

 

Never hurts to check the dipstick; seller may have forgotten to top it up. Also, look for oil bottles stockpiled in the under-floor tray.

a 2015 should be ok on the oil front: Toyota wised up and revised the pistons/rings partway through model year 2014.

At 144k miles the EGR clogging will be coming along and ensuing head gasket failure may have started. This can be seller’s motivation.