Transfer case oil
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2008-2013 Cadillac CTS Performance Mods Discussion, Transfer case oil in Cadillac CTS Second Generation Forum - 2008-2013; Any recommendations for what oil to use in the transfer case on an 08 CTS4 DI??...
  1. #1
    Badab!nG is offline Cadillac Owners Member
    Automobile(s): 2008 CTS4
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    Transfer case oil

    Any recommendations for what oil to use in the transfer case on an 08 CTS4 DI??

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  3. #2
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
    Automobile(s): 2010 CTS Shooting Brake W/Performance package, 3.6 DI
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    Re: Transfer case oil

    Rear Drive Module and Transfer Case
    (All-Wheel Drive) Transfer Case Fluid (GM Part No. U.S. 88861950, in Canada 88861951).

    From the 2010 Owners Manual. It's in there, easy to find.

  4. #3
    00 ss is offline Cadillac Owners Fanatic
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    Re: Transfer case oil

    Amsoil does not have a fluid that they say is a suitable substitute which leads me to believe the only place to get the right fluid is the dealer. Until very recently, I had to get the T-case fluid for our Grand Cherokee (NV247) at the Jeep dealer as well. I would not recommend using any fluid that is not specifically made for your T-case. With the complicated T-cases these days, using the wrong fluid will probably impair its ability to transfer the right amount of power to the rear/front wheels.

  5. #4
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: Transfer case oil

    Quote Originally Posted by 00 ss View Post
    Amsoil does not have a fluid that they say is a suitable substitute which leads me to believe the only place to get the right fluid is the dealer. Until very recently, I had to get the T-case fluid for our Grand Cherokee (NV247) at the Jeep dealer as well. I would not recommend using any fluid that is not specifically made for your T-case. With the complicated T-cases these days, using the wrong fluid will probably impair its ability to transfer the right amount of power to the rear/front wheels.
    ...and might void your warranty.

  6. #5
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Transfer case oil

    The front/rear power split is determined by the ratio of the planetary gears in the center differential gear set in the transfer case and does not vary.
    Don't mess with Binky Bear!


  7. #6
    00 ss is offline Cadillac Owners Fanatic
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    Re: Transfer case oil

    Everything I've read says that the T-case in our cars is a torque vectoring case with a viscous coupling. Meaning it can vary the amount of power sent to the front wheels vs the rear wheels. The "gear ratio" better be 1:1 front to rear or the font and rear wheels won't spin the same speed. It's not supposed to be just an open center differential.

  8. #7
    Badab!nG is offline Cadillac Owners Member
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    Re: Transfer case oil

    I did get my t-case oil from the dealer. After not finding a suitable Amsoil substitute.

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