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My transfer case had a small leak/ weeping. I changed the fluid to RP 75w140 last week. The seal no longer appears to be weeping now. I am glad this worked as I didn't feel like installing new seal.
It seems a tad quieter, but I can't be 100% positive. I did the diff's and tranny all the same time. The drivetrain also seems smoother. Much smother than my Audi with dog gears in the tranny.
I once owned an Audi 5000. Rode great, but lots of parts made out of margarine. And when you go to the dealer for a new fuel pump, you find out what puts the "OWW" in Audi .