High-temp brake fluid? diff fluid?
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2009-2014 Cadillac CTS-V Performance Mods Discussion, High-temp brake fluid? diff fluid? in Cadillac CTS-V Series Forum - 2009-2014; ...
  1. #1
    Jinx is offline Cadillac Owners Connoisseur
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    High-temp brake fluid? diff fluid?

    The manual says:

    For competitive driving, it is
    recommended that the brake fluid
    be replaced with a high performance
    brake fluid that has a dry boiling
    point greater than 279°C (534°F).
    After conversion to the high
    performance brake fluid, follow the
    brake fluid service
    recommendations outlined by the
    fluid manufacturer.

    Okay, a hot run over the Sierras isn't hot laps on the track, but it's in the neighborhood.

    Is there any downside to switching to a higher-temperature brake fluid?
    What do you recommend?

    What about diff fluid? Should I upgrade it, or change it, or just check it? I'm up to 2500 miles, and I haven't really wrung it out properly yet, just a few opportunistic acceleration blasts. I did a couple of half-hour 6/10ths twisty sessions back at the 800 mile mark.

    The V's first road trip starts in three weeks -- to Glacier National Park and back, about 2500 miles total.

    .Jinx

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  3. #2
    Snotty Boom Body is offline Cadillac Owners Fanatic
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    The rear end fluid is to easy to change to not do it. 1.5 quarts of 75w90 gear oil and a bottle of GM rear diff additive just to make sure and your done. A half hour job including walking to the fridge twice to get beer.

    The brake fluid can be upgraded to a Dot 4 with a good flush the only down side I think is that Dot 4 absorbs water quicker than Dot 3 that's why they tell you to follow the brake fluid manufacturers recommended change interval which will be shorter than OEM.
    So you'll have to do a quick flush every year or two with the upgraded fluid.
    .

  4. #3
    cruiser68 is offline Cadillac Owners Enthusiast
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    Re: High-temp brake fluid? diff fluid?

    I run Castrol SRF. Never boiled at the track. For the diff, any quality full synthetic. I run amsoil. My diff used to overheat on track days so I added a diff cooler. Also doubles capacity for diff fluid. I changed diff fluid early and found it was a little low. Also, no harm running better brake fluid...just a little damage to the wallet. I flush at least once a year usually twice.

  5. #4
    DCV
    DCV is offline Cadillac Owners Fanatic
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    Re: High-temp brake fluid? diff fluid?

    Motul RBF600 is also good high temp brake fluid to use. I use it in my KTM RC8R and have used it in other bikes and cars like my old Nismo Z, which had lots of brake issues using stock fluid...as noted when one got wadded in the lighting Lap.
    thebigjimsho likes this.

  6. #5
    V Wagon is offline Cadillac Owners Fanatic
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    Re: High-temp brake fluid? diff fluid?

    While Castrol SRF is a great fluid, it is ungodly expensive. The Motul is a great high temp fluid that I ran in my Lightning with great results. I have also run the ATE Super Blue in the Lightning, Cobalt SS, and our Lemons E30. The Super Blue is a great fluid and has the added bonus of being a different color so there is no doubt when you have all the original fluid bled out and new fluid through everything.

  7. #6
    cruiser68 is offline Cadillac Owners Enthusiast
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    Re: High-temp brake fluid? diff fluid?

    Quote Originally Posted by V Wagon View Post
    While Castrol SRF is a great fluid, it is ungodly expensive. The Motul is a great high temp fluid that I ran in my Lightning with great results. I have also run the ATE Super Blue in the Lightning, Cobalt SS, and our Lemons E30. The Super Blue is a great fluid and has the added bonus of being a different color so there is no doubt when you have all the original fluid bled out and new fluid through everything.
    +1 on the ATE. Used to run alternating Blue and Gold. Made it dummy proof to make sure you got the old fluid out. Good for me The Castrol is expensive. Ran the Motul 600 for years in my dirtbikes. Good stuff and quite a bit cheaper.

  8. #7
    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Re: High-temp brake fluid? diff fluid?

    Motul 600 and Amsoil diff fluid for my ole V...

  9. #8
    Jinx is offline Cadillac Owners Connoisseur
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    What's the spec for the factory fluid?

    Does anyone know the spec for the factory fluid?

  10. #9
    Bueller's Avatar
    Bueller is offline Cadillac Owners Enthusiast
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    Re: High-temp brake fluid? diff fluid?

    Is two quarts enough for the diff? How many of those small bottles of RBF600 for a full brake fluid change?

    ----------

    I searched and found this thread but didn't see this was in the 09-14 section. I have a V1. I don't want to start another thread, I'm sure someone can answer for me. Thanks.

  11. #10
    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Same answer for both. 2 small bottles of Motul. 2 liters of diff fluid...

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