Has anyone used the new Dexron 6 in their C5Z?

I'm wondering if it's safe to use in our transmissions.

 

Short answer - Auto yes, manual no.

 

Amsoil seems to be the club fav for DexIII replacement on a 6spd MT. I used Valvoline DexIII and couldnt be happier. GM Makes a special synth MTF (rebottled DexIII). dont use Dex VI, heard guys say it makes the MT's shift like crap and swap it out quickly after.

S

 

I used Redline d4-atf over the weekend and it is amazing. Along with my mgw shifter, it shifts like butter.

 

Is the Amsoil or Redline a synthetic?

I'm pretty sure I read somewhere that synthetic in the M6 was a no-no.

 

The redline is a synthetic. I bought mine because Froggy has been using it for a few years.

 

Ok thanks guys - I will source the Redline & Amsoil.

 

Amazon

 

Which Amsoil product is it?

 

Please use search. Had you done so you would have found this - posted a few days ago:



Document ID# 1897292


Subject:Manual Transmission Fluid Usage In 2007 And Prior Manual Transmissions And Transfer Cases - keywords case fluid manual transmission transfer #PIP3836B - (02/05/2007)


Models:2007 and Prior Passenger Cars and Trucks
2007 and Prior HUMMER H2
2007 HUMMER H3
2007 and Prior Saturn Passenger Cars and Trucks


This PI is superseded to add a note under concerns. Please discard PIP3836A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:

Use of manual transmission fluid part number 88861800 U.S. (88861801 Canada) in place of Dexron III.

Important Note: If the vehicle owners manual lists Dexron VI as the recommended transmission, transaxle or transfer case fluid disregard any information supplied in this PI. Use eSI and or the vehicle owners manual to determine what type of fluid should be used prior to referencing the below information

Recommendation/Instructions:

Manual Transmission fluid part number 88861800 U.S. (88861801 Canada) is currently available through GMSPO. Current and past model vehicles listed above with either a manual transmission or transfer case that REQUIRE Dexron III should use the above listed manual transmission fluid. This fluid is a direct replacement for Dexron III in manual transmissions and transfer cases. DO NOT use Dexron VI in place of the manual transmission fluid in any manual transmissions or transfer cases as a failure may result.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


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Crystal clear, I would submit.

Note that the GM Manual Transmission Fluid is a Dex III. And per the C5 documentation Dex III is what the MN6 needs.