Generation matters more than mileage with this compact. The 2011-2015 models earned their troubled reputation through a cascade of PCV valve failures that pressurize the crankcase and blow oil past every seal in reach, valve covers, timing covers, turbo lines all start weeping, turning ownership into a parts-replacement cycle. Coolant systems corrode from the inside out when neglected, and by 100k miles repair bills often exceed resale value. The 2016-2019 redesign fixed most of these gremlins and delivers the comfortable, well-equipped compact GM should have built from the start, but those improved cars are scarce on used lots. Manual transmissions of any year hold up better than automatics. If you're shopping used, a 2017 with 80k miles is a safer bet than a 2013 with 50k, the generation gap is that wide. Skip the first-gen unless you enjoy wrenching or have a trusted mechanic on speed dial.
The Elantra is a compact that split its reputation clean in half at 2021, before that line, you're shopping engines that seize and cars thieves steal with USB cables; after it, you're getting a genuinely competitive sedan with sharp looks and a warranty that backs the turnaround. The 2021-up cars deliver on value and the hybrid hits 40+ mpg without trying, but pre-2021 models carry catastrophic engine failure risk (Theta II bearing seizures, oil consumption) and the 2017-2021s remain theft-prone even post-recall. Buy 2021 or newer if the price works and you want modern features without the baggage; anything older is a gamble best left to someone else.