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Old 07-01-2018, 04:44 PM   #1
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What transmission fluid are you all running?

Any recommendations for a dedicated track car?
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Old 07-01-2018, 05:56 PM   #2
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I'm running OEM but next change I am going with Millers Nano CRX 75W90, but I have not yet so I can't give a first hand report on that. I put the OEM fill in 2014 and have maybe 50 track days on it, and plan to get a UOA when I change it. It hasn't given me any trouble with 20 minute sessions in summer, and sometimes I run 30+ in cooler weather if the car is staying cool.

These are my HPDE experiences and with stock.open diff.
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Old 07-01-2018, 09:54 PM   #3
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I have a reward cert to redeem for Miller's Oils, so I plan to try that next as they have a good reputation. But in the meantime, I have been using Mobil Delvac 75W90, which came highly recommended and has served my SPB well so far.
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Old 07-02-2018, 08:43 AM   #4
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This is interesting, as I have been going the other way.
I started out with Royal Purple Synchromax because I have had excellent results in other vehicles. It worked fine. After 2 years and 30 HPDE events, I drained and refilled with Porsche Fluid to see if there is any difference, knowing that it is the most recommended fluid for these transaxles.
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Old 07-02-2018, 09:26 AM   #5
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oem in my 5 speed
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Old 07-02-2018, 09:50 AM   #6
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I typically run OEM trans fluid.

I tried Millers Nano CRX 75W90 because (like trygve) I won a certificate from a race. In my experience, it worked fine - no better, no worse, than OEM.

(I had the same experience with Miller's motor oil - seemed to work just like any other high quality motor oil).
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Last edited by thstone; 07-02-2018 at 12:52 PM.
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Old 07-02-2018, 11:49 AM   #7
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I used Motul the first time I changed - but went back to OEM when I had the trans rebuilt. It's hard to tell the difference - because of the rebuild but it's shifts great now.
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Old 07-02-2018, 10:46 PM   #8
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OEM based on most discussions.
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Old 07-03-2018, 04:13 AM   #9
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I've run Redline in all my race cars..
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Old 07-03-2018, 05:01 AM   #10
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Currently using Redline 75w90NS. No complaints, but all I can compare it to was the unknown fluid that was in there prior for up to 97k Miles.
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Old 07-03-2018, 01:24 PM   #11
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My last fill was with Millers nano75w90
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