Fluid changes
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2004-2007 Cadillac CTS-V General Discussion Discussion, Fluid changes in Cadillac CTS-V Series Forum - 2004 - 2007; I am changing the trans,diff, and oil tomorrow. I picked up the following: Mobil 1 for engine oil Mobil 1 ...
  1. #1
    treeves is offline Cadillac Owners Member
    Automobile(s): 2004 CTS-V, 2011 CTS Coupe
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    Fluid changes

    I am changing the trans,diff, and oil tomorrow.

    I picked up the following:

    Mobil 1 for engine oil
    Mobil 1 synthetic atf fluid (Is this ok for our cars?)
    Royal Purple gear fluid

    Any thoughts? Anything else I should consider doing while I am changing all of this?

    I wasn't able to find amsoil or redline at any of the local places which is why I went with mobil 1 for atf and royal purple for the diff.

  2. #2
    MikeV is offline Cadillac Owners Fanatic
    Automobile(s): '05 Redline CTS-V
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    Re: Fluid changes

    I would wait on the trans fluid and order Amsoil ATD (torque-drive). You really want that fluid in the V, trust me. Makes the trans shift like butter.

  3. #3
    mitchntx is offline Cadillac Owners Member
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    Re: Fluid changes

    I changed my rear diff fluid in my 06 V this weekend.

    It took a smidge over a single quart to have fluid out the filler port.

    Does that sound right?

  4. #4
    WesH8398's Avatar
    WesH8398 is offline Cadillac Owners Enthusiast
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    Re: Fluid changes

    What viscosities are you going to be running? 75w90 in the dif? 5w30 in the engine? Before you change the trans fluid, I agree with MikeV that you should order some Amsoil Torque-Drive - it makes a definite difference in shift feel. While you're at it, get a hand pump from Amsoil too ($10). It'll attach right to the bottles and save you a whole lot of mess and headaches.

  5. #5
    mcbsff is offline Cadillac Owners Member
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    Re: Fluid changes

    +1 on the Amsoil Tranny Fluid. And remember - Search is your friend.

    -Treeves: You have to find someone that is an amsoil dealer or order it online. No one sells it retail. "c66 racing" in the forums here is a dealer. (I am personally baffled by the Amsoil business plan.... its good stuff, but they make it very hard to buy it.)

    -Mitchntx: Rear diff capacity is more like 1-1/2 quarts.

  6. #6
    your maker is offline Cadillac Owners Fanatic
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    Re: Fluid changes

    i know this is not a fluid but it does work with a fluid. your fuel filter i am sure you have over looked this like others

  7. #7
    C66 Racing's Avatar
    C66 Racing is offline Cadillac Owners Enthusiast
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    Re: Fluid changes

    Catching this one a little late - sorry, but for those browsing this thread and for future reference, I'm more than happy to get AMSOIL at dealer wholesale, about 25% below retail for forum members via the AMSOIL Preferred Customer Program. Anyone interested can drop me a PM anytime.

  8. #8
    ELES6CTS is offline Cadillac Owners Fanatic
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    Re: Fluid changes

    How much do we need for our tranny?

  9. #9
    kevm14 is offline Cadillac Owners Connoisseur
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    Re: Fluid changes

    4 quarts.

  10. #10
    bneal1022's Avatar
    bneal1022 is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 CTS-V, K&N, Borla, short throw w/ Holden knob, hotchkis
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    Re: Fluid changes

    i use:
    engine = synthetic 5w30 mobil 1
    tranny = royal purp synchromax
    diff = was royal purp max gear 75w90, new diff this weekend used amsoil severe gear 75-110 with redline "break-in" additive. use for 1st 500 miles then change fluid refill with new amsoil
    brakes, power steering and clutch (as best I can) = prestone dot 4 brake fluid... could do better here.

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