I just drained the oil and lubed the splines on the final drive of my 2011 RT. Does anyone with the newer RT know if you refill the final drive through the speed sensor plug hole or the breather hole? I tried refilling through the speed sensor hole but the oil is not going in easily. I knoe the final drive only takes 180 ml but I can only seem to get about 30 to 40 ml in before it wants to overflow. Does the breather hole need to be unplugged to get the oil into the speed sensor hole?