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  1. #1

    Default Mercon VI transfer case fluid compared to GM Auto-Trac II fluid

    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.

  2. #2
    Master Mechanic clgoch187's Avatar
    Join Date
    Aug 2010
    Gettysburg, Pennsylvania, United States


    the auto trac is a thicer oil, amd its like $8/ id go with the suggested fluid or amalee has a nice universal synthetic
    03 Silverado 1500
    285/75/16 BFG's
    2 Blaupunkt 10" vW1000 subs in Subthump box
    ProComp Level Lift & 3" rear blocks

  3. #3


    Amalee??? What kind is that.
    1998 K1500 Ext. Cab 4.3 5spd
    Amsoil, CIA

    2007 Harley Davidson Vrod
    Amsoil, Vance & Hines 2into1, K&N Topless,
    Screamin Eagle Racetuner, StageII cams,
    Carbon fiber front fender, and a few more lil goodies:wink:

  4. #4


    Maybe he means Amsoil?

  5. #5


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

  6. #6
    Master Mechanic clgoch187's Avatar
    Join Date
    Aug 2010
    Gettysburg, Pennsylvania, United States


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

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