Just changed the oil yesterday on the 13 Sonata 2.4L. I used 5qts of M1 EP 5W20 and 1/2 ish qt of m1 EP 5W30. I let the engine drain for 2 hours while i detailed the interior, and the engine took 5.65QTS to fill it back to full mark on dip stick. Prefilled the premium k&n oil filter with more then 1/3 QT 5W30 EP, ran 1/2 qt new oil through engine..
It was a smooth oil change, had about 10K miles/6 months of highway driving on this run of M1 EP 5W20, Will not happen again esp being the 2.4L with direct injected, and timing chain AND being above what hyundai recommends of 7500 miles under normal conditions. The old oil was pretty dark, but did not smell of gas or anything abnormal. I aim for 6 months 6K miles.
Cheers!