Few modern engines have generated as much controversy as Hyundai’s Theta II four-cylinder. Used in millions of Hyundai and Kia vehicles, the engine became the focus of recalls, lawsuits, government investigations and engine replacements. Teardown videos show the bearing damage left behind, while official recall filings explain how manufacturing defects could restrict oil flow and lead to failure.
The problems discussed here concern specific Theta II applications and production periods. Sharing an engine-family name does not mean every vehicle has the same defect or qualifies for the same recall.
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