Alright, I am going to do my first ever rear-diff change. From everything I have read and viewed I was expecting a torx head bolt on the top of the rear diff. Instead, I've found a large rubber insert that fits down into a hole on the top of the diff housing. So, at the risk of sounding like a nitwit, Is this all I have to remove in order to put in new oil? Also, what oil should I be using. Any help would be appreciated. Anyone with a 2013
R1200RT ever done this job?