If you need to replace the motor oil and replace the oil filter on the
1.8 liter Nu MPI I4 engine in your 2011, 2012 or 2013 Hyundai Elantra,
check out my concise guide to the procedure at the link below.
The steps should be the same or similar for other vehicles with the 1.6 Gamme or 1.8L / 2.0L Nu engines such as the Accent and Veloster.
Here's the DIY page -
http://www.paulstravelpictures.com/Hyundai-Elantra-Engine-Oil-Change-Guide/index.html
I hope someone finds it to be useful.
Cheers,
Paul