My son has a 2012 Hyundai Sonata limited 2 ltr turbo. On the highway in New Jersey the engine quit at 107,000 miles. He had it towed to a Hyundai dealership. They gave him a free rental until diagnosis was complete. They pulled the oil pan, and valve covers. They were clean, and free of sludge. Hyundai had some know issues with their engines. They replaced the engine free of charge. I was amazed!