I bought a 2015 Honda Civic last month. I've always done my own oil changes and I keep a little notebook in the glove compartment with all the service info - mileage, date and work done - so it's easy to look up when I had something done or whether I need to change the oil soon.
Manuals for every car I've owned had a chart telling you when to do everything from changing the electrons in the radio to replacing the timing belt.
My new car does not.
It has a dashboard indicator that is supposed to show a number, and you look in the book and find out what the number is telling you to do. That's fine for people who don't have a clue, and it probably helps with maintenance. Or maybe it just helps the customer bring the car back to the dealer and hand them the keys and their wallet, I don't know.
But you would think it's fair to at least include in the owner's manual how often you should change the oil. That's not asking too much, is it?