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Originally Posted by Vash
Actually for now stick with Dexron VI for that 6 speed TH (6L80). I don't think it would hurt but it has all the Dexron certs except for Dex6.
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+1, Dextron 6 is GM's own synthetic transmission fluid, and is required on all 06 and newer transmissions.
http://media.gm.com/servlet/GatewayS...39&docid=13541
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Originally Posted by GM
Beginning with the design and development of GM's new Hydra-Matic 6-speed rear-wheel-drive transmissions, GM Powertrain engineers determined the need for a new transmission fluid to withstand the complexity of the clutch-to-clutch transmission operation. Additionally, GM engineers identified opportunities to improve viscosity, durability, and impact on fuel economy with a new fluid.
"The development of DEXRONŽ-VI is the first time an automotive company has worked so closely with petroleum and additive companies to develop a new fluid," says Roy Fewkes, driveline fluids group leader, GM Powertrain. "The result is a new fluid that significantly outperforms existing fluids in every aspect. In fact, we have had to significantly extend the length of our durability tests to fully test the fluid's capability."
Internal GM tests have demonstrated DEXRONŽ-VI to deliver more than twice the durability and stability in friction tests compared to existing fluids. It also has demonstrated superior performance in pitting, foaming, oxidation and shear stability tests.
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On their own website, royal purple says they do not have an equivelant to Dex6, so royal purple would void your warranty. Amsoil does say their atf is dex6 compatable, but considering how much better GM's Dex6 is vs Dex3, I really don't see how much of an improvement amsoil could be, besides being able to say you have amsoil in your transmission.
I know that the m6 takes atf, and not gear oil. I do not know for sure if the newer ones are compatable with Dex6, though they should be. The older ones had blocker rings that would dissolve in synthetic fluid, so I would double check before you swap out the fluid. I wouldnt add syncromesh. If you use a high enough quality oil to begin with (like what GM puts in there), and maintain it properly, any additives you put in the fluid are a waste of money and in most cases will actually be WORSE for your transmission.