Royal purple synchromesh in our T56 M12(little research)
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Royal purple synchromesh in our T56 M12(little research) in Cadillac CTS-V Series Forum - 2004 - 2007; My performance shop recommended Royal Purple synchromesh in my T56 and I read somewhere that RP synchromesh is not good ...
  1. #1
    tigerlion is offline Cadillac Owners Member
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    Royal purple synchromesh in our T56 M12(little research)

    My performance shop recommended Royal Purple synchromesh in my T56 and I read somewhere that RP synchromesh is not good for our blocker ring.

    So I researched little bit about it and here is what I found out.

    In the past, T56 had paper lined blocker ring and it was vulnerable to the synthetic oils. So some people messed their blocker ring by using RP synchromesh and others.

    However, after some point(2001), carbon high density blocker ring was introduced in T56 and it is not damaged by synthetic oil anymore. So actually, synthetic is good for our T56 because it will hold heat much better than non-synthetic.(Even Dexron VI compatible) (information here cadillacfaq.com/faq/answers/pdf/t56-06.pdf)

    MY Summary
    RP synchromesh is good for our T56.


    What do you guys think about it?

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    lollygagger8's Avatar
    lollygagger8 is offline Cadillac Owners Connoisseur
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    Re: Royal purple synchromesh in our T56 M12(little research)

    I've used Mobil 1 forever and haven't had any probs

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    MikeV is offline Cadillac Owners Fanatic
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    Re: Royal purple synchromesh in our T56 M12(little research)

    amsoil ATD here. no worries.

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    CancerJCC is offline Cadillac Owners Connoisseur
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    Re: Royal purple synchromesh in our T56 M12(little research)

    Quote Originally Posted by lollygagger8 View Post
    I've used Mobil 1 forever and haven't had any probs
    Quote Originally Posted by MikeV View Post
    amsoil ATD here. no worries.
    I used M1 for the first change and now currently have the Amsoil ATD in there and can't tell a difference. (Street dd).

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    ronr's Avatar
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    Re: Royal purple synchromesh in our T56 M12(little research)

    When RPM Transmissions put mine in they used Royal Purple.
    '04 Platinum, Maggie, Corsa cat back, StealthV tune, UUC short throw shifter, Autovation Pedals, Lingenfelder CAI, GC coilovers, Hotchkis sway bars, UUC braided brake lines, Katech LS9 clutch, Level V RPM Transmission, Creative Steel engine & trans mounts

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    C66 Racing's Avatar
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    Re: Royal purple synchromesh in our T56 M12(little research)

    You are correct about the paper blocker rings and synthetic fluids. Tremec stopped using paper blocker rings in 2000, so all of this gen CTS-V will be okay. I've been using synthetic tranny fluids in my 02 Corvette Z06 since it had about 800 miles on it, and I used the AMSOIL Torque-Drive Synthetic Transmission Fluid (Product Code ATD1G) in my CTS-V (sold in 09).

    As for which fluid to use, that is always a hotly debated topic. Most will view me as biased as I'm now an AMSOIL Dealer as part of my racing efforts (they do not sponsor me), but in 2003 after losing a race engine I did my own research and made my own conclusions chosing AMSOIL. While not tranny fluid, these two studies may be interesting in highlighting the differences between various fluids even if you discount the AMSOIL fluids from the study. My takeaway for Royal Purple is that they have very poor viscosity shear down (sheared low out of grade in the motorcycle 40 and 50 grade tests as well as the gear lube test) and I personally would chose another option.

    AMSOIL Motorcycle Oil “White Paper” (1 MB pdf file)
    AMSOIL Gear Lube “White Paper” (2 MB pdf file)

  8. #7
    liqidvenom is offline Cadillac Owners Connoisseur
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    Re: Royal purple synchromesh in our T56 M12(little research)

    Quote Originally Posted by lollygagger8 View Post
    I've used Mobil 1 forever and haven't had any probs
    which do you use? i have it in my car and it shifts like crap when it below freezing.

  9. #8
    vetteboy2k is offline Cadillac Owners Fanatic
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    Re: Royal purple synchromesh in our T56 M12(little research)

    I think most fluid shifts like that until its warmed up. I had put RP in and hated it in the cold, regular Dex III was better in the cold and amsoil is slightly better as well. Though its nothing like it when its fully warmed up.

    Think its the nature of the beast

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    Re: Royal purple synchromesh in our T56 M12(little research)

    Quote Originally Posted by liqidvenom View Post
    which do you use? i have it in my car and it shifts like crap when it below freezing.
    Pretty certain it's Mobil 1 ATF. I don't drive mine in the winter, but have driven it when it's very cold out. Sometimes it might be a little stiff for a mile or two, but it loosens back up no prob.

  11. #10
    redxiv is offline Cadillac Owners Member
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    Re: Royal purple synchromesh in our T56 M12(little research)

    I'm running RP synchromesh in my tranny. RP gear oil in the diff. And RP oil in the LS2. Here's my takeaway. Although I haven't driven in the cold yet, I have driven it in an autocross. The tranny was significant improvement. Shifted very smoothly, comparatively. The change was well worth the price IMO. The diff fluid seems todo okay. It feels like the limited slip grips a little quicker cause it seemed to want to spin quicker ,but that may just be me. The engine oil doesn't seem to make a huge difference. It may be smoother but not really noticeable over the mobile1 I'd been using. I really like the tranny fluid. Now if I can only tighten up the slop in in the shifter.

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