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#4583910 - 11/24/17 06:33 PM Best Dextron Vl brand for overheating conditions
911Hunter Offline


Registered: 11/24/17
Posts: 3
Loc: RGV Texas
Hi Guys,
Recently I went to a HPDE event on my '14 Corvette Stingray Z51, which has an automatic transmission. Each time that I went to the track after lapping hard my Corvette it overheated its transmission and I had to abandon the circuit for my vehicle to cool down. But on the street or road my car has never overheated. I was wondering if there is a better brand of Dextron Vl fluid that could help me out while taking my car to the circuit, I don't want to lose my powertrain's warranty by going the aftermarket way. Please advise.


Edited by 911Hunter (11/24/17 06:36 PM)

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#4583916 - 11/24/17 06:41 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
Chris142 Offline


Registered: 06/05/03
Posts: 16812
Loc: Deplorable in apple valley, ca
Put a cooler on it.
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#4583919 - 11/24/17 06:43 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
ls1mike Online   content


Registered: 06/14/08
Posts: 5105
Loc: In the Garage...
Cooler and done, cooler should not void it.
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#4583920 - 11/24/17 06:44 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
This ^^^^^^ Iíll bet Chevy even makes one for your car.


Edited by double vanos (11/24/17 06:44 PM)
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#4583922 - 11/24/17 06:45 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
bdcardinal Online   content


Registered: 06/03/05
Posts: 10978
Loc: Santa Barbara, CA
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#4583980 - 11/24/17 07:52 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6136
Loc: USA
Redline D6 might work for you smile

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#4583984 - 11/24/17 07:55 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
clinebarger Offline


Registered: 12/19/13
Posts: 1898
Loc: Fort Worth, Texas
Auxiliary trans cooler like others have stated.

Deeper/High Capacity transmission pans can CAUSE issues with the fluid climbing the rear of the pan during hard acceleration...Therefore uncovering the pick-up/filter leading to burnt frictions &/or "Limp-Mode". At least make sure it has baffling in the pan & hope it was tested thoroughly if you decide to go with a higher capacity pan
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#4584114 - 11/24/17 11:25 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
911Hunter Offline


Registered: 11/24/17
Posts: 3
Loc: RGV Texas
I agree with you all, about that an improvement on the transmission cooler would be the best option. The track packaged Z51 already comes with a differential & transmission coolers with an integrated fan on the rear left side with additional rear side vents for cooling purpose, but apparently it was not enough since the '16 model was upgraded with an additional front cooler similar to its big brother Z06. But this upgrades aren't authorized by GM to prior years with risk of losing your powertrain warranty. Also LG's coolers look like a great option, but same thing related to GM's warranty. Then probably red line synthetic transmission fluid could be an option while I wait for the GM warranty to expire for me to install either cooler: GM's or LG's.


Edited by 911Hunter (11/24/17 11:37 PM)

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#4584158 - 11/25/17 03:51 AM Re: Best Dextron Vl brand for overheating conditions [Re: Chris142]
Lubener Offline


Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
Originally Posted By: Chris142
Put a cooler on it.

Agree. No specific fluid is going to prevent overheating.
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#4584258 - 11/25/17 07:42 AM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
Audios Offline


Registered: 11/19/11
Posts: 879
Loc: Lyndhurst NJ
Cooler with a thermostat if possible, so the fluid doesnt run cooler than it should when not tracking.
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#4584337 - 11/25/17 09:34 AM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Change fluid all you want. Won't make a difference at all.

Talk to your dealer and GM. Pick away at both until they develop a solution.
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#4584633 - 11/25/17 03:34 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
bdcardinal Online   content


Registered: 06/03/05
Posts: 10978
Loc: Santa Barbara, CA
Or wait until the warranty runs up and have at it.
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2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.

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#4584817 - 11/25/17 07:10 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
xtell Offline


Registered: 12/13/06
Posts: 520
Loc: ohio
Mount the biggest oil cooler you can fit in and do a fluid change with Valvoline Dexron VI fluid. It is a synthetic fluid.

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#4586013 - 11/26/17 07:11 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
Whitewolf Offline


Registered: 10/05/06
Posts: 2912
Loc: MI, USA
Try DEXRON HP it's still a DEXRON-VI but full PAO/Ester.
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#4586138 - 11/26/17 09:12 PM Re: Best Dextron Vl brand for overheating conditions [Re: 911Hunter]
Oil_Flunky Offline


Registered: 06/23/09
Posts: 96
Loc: Michigan
Lubegard Red at 1.5 ounces per quart should bring temps down significantly.
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