I recently just got an oil change for my 2010 Hyundai Elantra GLS, but the shop that I went to forgot to put the sticker at the top of my front windshield so I'm not sure when I should get my next one.
As per the vehicle manufacturer, they recommend that you follow the maintenance schedule outlined in the owner’s manual of your 2010 Elantra. They recommend that you have the oil changed every 6 months or 6,000 km, whichever comes first. Since you do not recall the mileage or time your oil change was performed, I would recommend performing an oil change as soon as possible. One of our Fiix technicians would be more than happy to do so, right at your house.