T56 fluid change time

DesertCobra · 04-04-2005, 06:37 PM

Getting ready to drop my trans fluid after 28K mi and I see three popular
choices:

Dexron III (Stock trans fluid)
GM Synchromesh (GM recommended T-56 transmissions)
Mobile 1 ATF (Aftermarket high performance ATF)

From what I read here, lots of people prefer Mobil 1 or
GM Synchromesh fluid over stock Dexron III ATF fluid.

My concern is that GM fluid does not appear to be an ATF and
thus can not stand up to high temperature as well as ATF types.
Here in the Arizona, with summer temperatures of 110F+

... thats hot.

I've also heard that Mobile 1 ATF offers smoother shifting ?

So, in conclusion, my only question is whether Mobile 1 offers any improved protection and shifting improvements over Dexon III fluid ??

Any comments from Mobile 1 or GM Sychromesh users ?

Hazman · 04-04-2005, 08:05 PM

Currently using Mobil 1 and it seems to do well, better than stock fluid. Getting ready to change to Amsoil.

blk04cobra1 · 04-05-2005, 08:14 AM

gonna swap to GM Syncromesh pretty soon...a few friends have switched to it and said it got rid of some of the noise in the trans

04-04-2005, 06:37 PM	#1
DesertCobra Registered User Join Date: Sep 2004 Posts: 18	T56 fluid change time Getting ready to drop my trans fluid after 28K mi and I see three popular choices: Dexron III (Stock trans fluid) GM Synchromesh (GM recommended T-56 transmissions) Mobile 1 ATF (Aftermarket high performance ATF) From what I read here, lots of people prefer Mobil 1 or GM Synchromesh fluid over stock Dexron III ATF fluid. My concern is that GM fluid does not appear to be an ATF and thus can not stand up to high temperature as well as ATF types. Here in the Arizona, with summer temperatures of 110F+ ... thats hot. I've also heard that Mobile 1 ATF offers smoother shifting ? So, in conclusion, my only question is whether Mobile 1 offers any improved protection and shifting improvements over Dexon III fluid ?? Any comments from Mobile 1 or GM Sychromesh users ? __________________ 2005 White SVT Cobra Magnaflow Cat Backs Apten CAI MGW Shifter

04-05-2005, 08:14 AM	#3
blk04cobra1 Registered User Join Date: Nov 2004 Location: Charlotte, NC Posts: 1,374	gonna swap to GM Syncromesh pretty soon...a few friends have switched to it and said it got rid of some of the noise in the trans __________________ 2004 Cobra HP Twin 67's 785rwhp on 9lbs of boost

04-04-2005, 08:05 PM	#2
Hazman Registered User Join Date: Sep 2002 Location: Harriman, TN Posts: 823	Currently using Mobil 1 and it seems to do well, better than stock fluid. Getting ready to change to Amsoil.

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