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Thread: Need some advice in diff and transfer case fluids.

  1. #1
    OMG's Avatar
    OMG is offline Cadillac Owners Fanatic
    Automobile(s): 2008 CTS4 3.6DI
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    Need some advice in diff and transfer case fluids.

    Hey guys tomorrow I am changing my front and rear diff fluids along with my transfer case fluid (hopefully) in preparation of my track day on wed (and my warranty expired today).. I picked up Royal Purple 75-90 Max gear because it had limited slip additive already in it. They only had one bottle in stock so grabbed that on wed. Came in today for the second bottle and now they have 75-140 and get this it's $5 cheaper per bottle. So now I'm wondering if I should get this instead? I know that some people use the higher weights for racing applications. But wondering if I really should get it for the one track day a year and I'm only doing 1-3 runs at most. How much of mileage penalty will I experience?

    And last question any recommendations for the transfer case? Royal purple and Amsoil did not have one for it.

    I will be taking pictures and posting a DIY of all 3 projects when done. Thanks guys!


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  3. #2
    BobbyandRyan's Avatar
    BobbyandRyan is offline Cadillac Owners Fanatic
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    Looking forward to your write up as I will be doing the same very soon.

  4. #3
    OMG's Avatar
    OMG is offline Cadillac Owners Fanatic
    Automobile(s): 2008 CTS4 3.6DI
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    Northern IL Suburbs
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    Re: Need some advice in diff and transfer case fluids.

    Sorry I was also helping my friend plasti dip his wheels yesterday and it took the whole day so I was not able to get it done yet.


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