Subdriver

Sounds like a guy trying to make you buy his fluid. The Magnuson-Moss Act makes it illegal for any manufacturer to tie warranty provisions to use of a specific fluid unless they provide you the fluid or they have a waiver on file. Thus the auto manufacturers list specifications for the replacement fluid, not an actual fluid. Any fluid, synthetic or non-synthetic, meeting GM Dexron III standards will absolutely not invalidate your warranty.

And yes, the factory fluid is not synthetic, so in my humble opinion, any synthetic you use will be a vast step up.

GM is learning this lesson and they have recently come out with a new fluid, Dexron VI. From what I've read, to meet the new Dexron VI standard, a fluid will have to be either at least a Group III synthetic, or possibly a Group II/III blend. To the best of my knowledge, no aftermarket company has come out with a fluid meeting the new Dexron VI standard yet. Since AMSOIL uses a Group IV synthetic base stock, I'm sure they'll have no problem meeting the new standard, they just have to formulate one to the proper viscosity requirements of the new fluid.

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AMSOIL Direct Dealer
AMSOIL Ordering Information (Retail sales using reference #1206638 benefit the forum)

 

BigNick

I just checked my '06 Owners Manual.

For the automatic transmission, it specifies: Dexron-VI Automatic Transmission Fluid.

For the manual transmission, it specifies: Dexron-III Automatic Transmission Fluid. Look for "Approved for the H-Specification" on the label. (The same exact wording is also specified for the power steering system)

I have a six-speed, so I assume III-H is all that is necessary for mine.

This was in the PDF manual downloaded from mygmlink.com, not the paper manual as that is out in the glove box.

Groucho

I pur Royal Purple Synchromax synthetic in my tranny. Awesome stuff. Shifts better, quieter.

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ModBoss2

Same thing that I used, instead of the ATF synthetic.