Just took a look as I know someone with an Optima.
Included are the 2013–2014 Hyundai Sonata and Santa Fe, 2011–2013 Kia Sportage, 2011–2014 Optima, and 2012–2014 Sorento. During machining of the engine crankshaft and crankpins, metal shavings may have been left within the crankshaft oil passages, and the crankpins themselves may be too rough on the edges. As a result, oil may be blocked and cause the connecting rod bearings to wear, which would then cause them to fail and seize the whole engine. That, of course, would cause the car to stall during driving