I have a 2016 pilot touring with 9 speed. I had one maintenance minder come on for first oil change and that was it. Now have 80,000 miles and have never had maintenance minder since first one. Have been told by dealers that differential should be changed every 15,000. I do not like that the owners manual does not give a actual maintenance interval schedule. What should I have done at next oil change. Had transmission/differential/transfer case and brake fluid done about 70,000.