Things needed for a 2014/2015/2016 SkyActiv Mazda 3 oil change: 5 quarts 0W-20, 6 quarts if you've got the 2.5L motor and are a "top of dipstick" kind of person. A Wix 57002 filter. An 8mm wrench or socket, an 8mm hex driver (or Allen wrench), and a medium flathead screwdriver.
Read on for what the oil change process involves. But that's probably what you wanted to know, isn't it?
Why am I doing a writeup on a 2015 Mazda 3 oil and filter change on a blog focused on electric bikes, solar, and small electronics? Because I hate Tap-A-Talk full screen annoyances and car forum mobile themes, that's why! It's rather off in the weeds for my blog, but it took a bunch of searching and a phone call to the dealership (including waiting on hold) to find this information when I went to pick up oil for my car without the actual car. Hopefully this remains helpful for people going forward.