Make sure to read this excellent tomcat1446’s post:
CX-5 Oil Change with Filter
Or entire thread if you have time.
The use of 8mm hex head drain plug is unique to CX-5, and oil quantity with oil and filter change specified in owner’s manual is incorrect. It should be about 5.2~5.3 quarts instead of 4.8 quarts for SA-G 2.5L, but most people put 5 quarts of fresh oil for convenience and leave the oil level between “Add” and “Full” mark on the dipstick.
That thread is a must read for anyone changing their own oil. I’m getting ready to drain the factory fill here soon.