Apparently this what we should put into our manual transmission accordingly to a GM tech

 

You might want to study Amsoil Synthetic Torque Drive Heavy Duty Transmission Fluid. I switched to this product about 20,000 miles ago in my MN6 2004 Coupe.
VS

 

No, not apparently. This is what you want if you are going with delco. Do not use dex VI.

https://www.summitracing.com/parts/a...SABEgKw4_D_BwE

The content of this bulletin does not apply to manual transmissions or transfer cases. Any vehicle that previously required DEXRON®-III for a manual transmission or transfer case should now use P/N 88861800. This fluid is labeled Manual Transmission and Transfer Case Fluid. Power Steering Systems should now use P/N 9985010 labeled Power Steering Fluid.

 

And find a new tech

 

Interesting.... I might need to change my trans fluid now. I don't remember what we put in it, but I know it wasn't that.

 

GM themselves issued a service bulletin when Dex VI was released (below). Our MT's require a lube to Dex III specs.

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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This PI is superseded to add a note under concerns.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.

[color=red]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 [/color:3b3bd6900c]

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 Posted on: 2008/2/10 15:04

 

Redline D4

https://www.summitracing.com/parts/red-30505

 

have you try it or you are just pitching a name for fun

 

Mobil's 'find the right oil' tool suggests Synthetic ATF.
I used their 'ask a question' feature from that page to see if they would clarify but I'm guessing since they also have DEXRON VI ATF they will probably just say yes, Synthetic ATF is the correct one.

 

It’s what I use. Top notch stuff!

Not all synthetics are the same.

 

Me too, been using it in my '01 since 2002..................

 

Is there really THAT much difference between III and IV in a manual trans applications? I mean, if you run III, and change to IV, is it doom and gloom, with certain trans failure soon to follow? I have an A4, and they CAN be fussy as to what lube is run. But motorcycles and snowmobiles have recommended ATF for their manual/chaincase/mechanical transmissions for decades. There are many things I was really **** about when I was 20-30 years old, and you gotta do this, or you have to run that, and ultimately found out later it didn't really matter in the long run. Not saying I'm right in this case, but many times I've found some "absolutely must" run this or that or catastrophic failure is sure to happen, to be totally false, and not the case at all. Just sayin'......

 

ask RPM what they think about it
I totally agree with them.. I dislike anything Redline

 

I used Amsoil Signature ATF in my '03 6MN

 

Dex6 is recc unless u have cardboard blocking rings in earlier c5 manuals

 

Race Proven Motorsport?

 

Care to share the info?

 

The T56 is Dex 3 same as all the T56 from the same era like in the Camaro etc. If your feeling brave a half qt of sycromesh mixed in will make it shift a bit better. That was a recommendation from my transmission guy and it works. As to long term issues doing that I don’t know and don’t care

 

According to GM there is. I guess warranty claims made up their minds for them. When GM says stick with Dex III equivalent lubes or risk failures (I would guess synchro failures) per multiple bulletins (sample above), I would not disagree.

 

-----------------------------------------
What exactly is this bulletin saying?

"DO NOT use Dexron VI in place of the manual transmission fluid "
DEXRON VI supersedes DEXRON III and is used by the "by professional technicians" at VA Koons GM service center.
" DO NOT assume that the bulletin applies to your vehicle "
For "Models: 2007 and Prior Passenger Cars and Trucks"
What is it supposed to apply to?

Reads like classic CYA?