I use full synthetic but I still change oil around 3k, but that's me.
Just did my 1st oil change on my wifes new (to her) 2015 Sport, had 19k on it and the dealership was supposedly changed it before we took delivery of it. They use Motorcraft 5W30 semi-synthetic but it look to dark for my liking and I know the dealership well, worked there fir 15 years. So I know the shenanigans that goes on, new filter and just Topped Off the oil.