Changed the oils in the differentials last night. Front was milky but the rear wasn’t. Flushed with diesel a couple times and put new oil in. From reading other threads it sounds like there is no way to prevent water from getting in due to a rusty drive shaft, or is that problem only on the 660s? I ride in a lot of water but never deep enough to reach the vent line. How likely is it for water to get in from the vent line? I have been close but I dont think I have ever been that deep. I didn’t check the fill hole before I drained it so I dont know how much got in it and I have no idea how long its been like this but there was no sign of damage. Anyone else having this problem?