Hyundai’s Problematic Theta Engine Hits 180,000 Miles — Teardown Reveals Why

A Reputation That’s Hard to ShakeThe Hyundai Theta II 2.4-liter engine has a reputation that’s hard to ignore. Recalls, lawsuits, and owner complaints have piled up, mostly due to engine failures caused by bearing wear and oil starvation. Manufacturing debris, lubrication issues, and questions about long-term durability have all contributed to making this one of the more troublesome modern four-cylinders.This reputation was built up over the years. Across Hyundai and Kia models, the same pattern kept showing up: rod knock, seized internals, and sometimes full engine replacements. Still, there are a few engines that have gone much farther than most.That’s why this teardown, courtesy of I Do Cars, stands out. Seeing a Theta II go past 180,000 miles suggests it eit …