A few weeks ago, when I took my 2013 C-Max in for an oil change, the technician discovered a very slow transmission leak--apparently from a seal somewhere in the unit. It wasn't so bad that fluid needed adding, but it did need to be repaired under the warranty. Although I needed the vehicle for a few more weeks, I did take it in for the repair. It was a big deal that took several days and involved removing the entire engine/drive train. I had thought that it would be a more simple repair job