In my Scout II, the transfer case utilizes 90 weight mineral oil.  
According to my shop manual, the materials used inside of the tranfer case 
require its use.  I assume it is because of brass or bronze bushings.  I'm 
thinking I pay $18 per gallon.  Very interesting in appearance, it looks 
like light colored Olive Oil. I buy it in bulk at the local IH dealership as 
I have more binders than I can accurately count...  sigh...
SDSteve
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