I just changed my chain case oil today - I have never liked the chain case oil to begin with, its always black (even though it's brand new with zero miles on it) So I put in Mobil one 75W90 synthetic gear lube and added 2 oz. of Energy Release (take a old ski-doo chain case bottle fill the bottle to service level, minus 2 oz. add the 2 oz. of ER) stuff works, most of the snocross racers use ER in they're chain case's !!!
Under the chain case there is a drain plug (allen head screw) just remove it, fill chain case back to proper level, check for leaks, lift sled off the floor and run a operational check to see if the oil is staying where the oil s'pose to be (in the chain case) it's pretty easy job and you'll be happier with a different chain case oil anyways.
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