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Discussion Starter #1
I have a 2010 Tahoe 4X4 and the fluid recommened for the transfer case is Mercon VI , it is a single speed transfer case.
I use to own a 2006 GMC ,Envoy ,4X4, two speed trans. case., and the transfer case fluid recommended for that truck was Auto-Trac II fluid . #12378508, oil is blue in color.

It seems to me the Auto-Trac II would be better for the Tahoe .

Here is what it says on the plastic Qt. bottle.----

For four wheel drive vehicles with automatic transfer case.
Withstands extended high temperature operation.
Improved oxidation resistance.

Does any one know if this is a better quality oil than the Mercon.
I think I read somewhere it is better oil to resist corrosion of aluminum cases.
 

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the auto trac is a thicer oil, amd its like $8/qt........so id go with the suggested fluid or amalee has a nice universal synthetic
 

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Amalee??? What kind is that.
 

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Maybe he means Amsoil?
 

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Thats what I was thinking but thought I missed out on a new product.
 

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it comes from Fishers (Federated Auto), good stuff and its approved to meet or supersede pretty much any trans fluid
 
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