The Sonata offers sharp styling and premium tech at a price that undercuts the Accord, but the 2011-2019 Theta II engines were catastrophic, seized motors, oil consumption, and rod bearing failures between 60k-100k miles, with dealerships often fighting warranty claims. The 2020 redesign brought fresh looks and the 2022+ SmartStream engines show real improvement, but depreciation still reflects the older models' sins. Walk past anything pre-2020; current-gen buyers get genuine value and a 10-year warranty, but you're betting Hyundai has truly fixed what broke.
The Forte splits into two extremes: one owner hit 750,000 miles on a 2018 model with obsessive oil changes every 10-15k, while others watched their engines grenade under 100k following the manual's 5,000-mile intervals. The 2.0L and 2.4L Theta II engines carry documented rod bearing and oil dilution issues covered by class-action lawsuits, Kia replaces engines under warranty, but you're betting on whether yours lasts 30k or 700k. Ignition coils on 2016+ models arc to the block instead of firing, causing misfires until you swap in upgraded parts. Pre-2022 models face theft risk and insurance headaches despite 2022+ having immobilizers. Buy it if you're the type who keeps service records in a binder and changes oil early; skip it if you treat maintenance as optional.