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Best Differential fluid to use?

there are going to be many different opinions pertaining to this. I use Lucas in both my front and rear diffs and yes it is a bit heavy/thick, but I am running Powertrax lockers front and rear and have not had a problem to date (knock on wood!)
 
I think that the Lucas I am using is 85/140

like I said, it is thick but good. It might be too thick for a super cold north winter morning though. I am in northern Missouri and our winters can be bad, but I have never had a problem with this heavy of a fluid.
 
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