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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?

1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
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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.
2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,BIlstein PSS9s,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 90K miles
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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).
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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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..
1998 986 (daily driver)
1999 986 (SPB)
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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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