I've never personally seen a 2.4L blown up let alone a Rio...
Yes I've heard and read stories, but they are all online and I have no first hand experience, even though I have owned a few 2.4L Hyundai vehicles, and two 2.0L turbo sonata sport / optima sx.. Currently have two 2.4L's in the stable. Ones a DI in the 13 sonata, the other is non di in the SX..
Marketplace has a couple 200K plus H/K's with blown engines... but its not like are every other H/K engine is blowing up. Yes there are "some" but in the grand scheme of pure numbers, its pretty low imho and acceptable.