After look at this post and the very relevant question about do people actually use OOP in the course, I really should highlight that it is indeed used in real code.
Ross and I spent a day looking through some source code of some fortran programs that are heavily used on our clusters. We found many occurrences of things like interface, type(), extends, etc. that are associated with OOP style programing. It would be good to focus a little more effort on this and to put some text in the intro about this to help motive the course.