[rmg2800]

GM has released a new bulletin to address the torque converter shudders, bulletin TSB 18-NA-355. Dealers will perform an updated flush procedure with a new Mobil 1 Synthetic LV ATF HP. Dealers in priority states should receive the updated tool kit and fluid late January- February. Friend of mine in a different state said GM told them March.

 

[Speeder52]

Are you able to post a copy of TSB 18-NA-355?

 

[rmg2800]

Sorry for the delayed repose, probably not its like 30 pages long.

 

[dcpattie]

I might start bringing my own Mobil 1 motor oil as well - clearly the Dexos transmission fluid sucked so why would I trust it for my engine? Mobil 1 all the way!

 

[pkincy]

If anyone can tell me how to post a pdf I will post it.

 

[sadpanda]

Could host from Dropbox/gdrive, print as jpg OR what usually happens is a simple copy/past of the text

IMHO no amount of fluid changing /flushing is going to fix this.

 

[Leesrt]

I had the fluid flush done on the original TSB and it fixed the shudder issue. I brought it back to the dealership for the new TSB and they are going to flush and refill with the newer Mobile 1 HP fluid next week.

 

[pkincy]

We get 20 qts of the new ATF flushed in and out of the system in steps. The CT6 gets 24 qts. The steps for the flush are slightly different from the ATS to the ATS-V but the ATF is the same.

The text is 30 page long so I won't copy and paste it here.

 

[pkincy]

I might start bringing my own Mobil 1 motor oil as well - clearly the Dexos transmission fluid sucked so why would I trust it for my engine? Mobil 1 all the way!

I can't imagine that the dealer doesn't have Mobil One in bulk. They need it for the CTS-V.

 

[pkincy]

New blue label bottle:

 

[Leesrt]

New blue label bottle:

My service manager told me when they did my first TSB (175) they thought they used the correct fluid that is in the current TSB (355). When he compared them they are both the same name (Mobil 1 Synthetic LV ATF HP) however on further inspection the part numbers are different. He researched the part numbers and found the newer part number is not the same fluid even though it has same name. It's a different formulation. He even brought the older formulation out to show me.
If you take your car into the dealership advise them of this because they may have some of the older fluid around and by name it's correct. They need to verify the part number.

 

[pkincy]

The GM part nos may be different but the Mobil One numbers are the same. The only tell is the blue background of the new formulation vs the black of the old.

 

[Screamineagle]

My service manager told me when they did my first TSB (175) they thought they used the correct fluid that is in the current TSB (355). When he compared them they are both the same name (Mobil 1 Synthetic LV ATF HP) however on further inspection the part numbers are different. He researched the part numbers and found the newer part number is not the same fluid even though it has same name. It's a different formulation. He even brought the older formulation out to show me.
If you take your car into the dealership advise them of this because they may have some of the older fluid around and by name it's correct. They need to verify the part number.

Do you know the 2 different part numbers? Mine is in now getting it done, want to make sure they didn't use the wrong fluid.