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CN someone explain to me what a triple flush is? Is it just changing the trans fluid? I’m buying a 2014 Z51 and dealer doesn’t know if this was ever done. Should I drive the car and see if it ahidders before I do the flush?
CN someone explain to me what a triple flush is? Is it just changing the trans fluid? I’m buying a 2014 Z51 and dealer doesn’t know if this was ever done. Should I drive the car and see if it ahidders before I do the flush?
You need not worry sir. The 2014 C7 has the A6 (6 speed) transmission. It's bullet proof.
Having owned and A6 C6 - I love the A8 so much better.
I put 166K miles on the C6 with regular ATF changes every 50K. No problems. The differential was the C6 weak link.
I think the new flush is a SINGLE and blow out all the lines. Don't do the triple any more. I too would like to get the new fluid on GM's dime. Maybe GM will do a TSB and do for all even though your aren't having problem.
The bulletin is #16-NA-175 dated Dec 1, 2017.
Earlier versions of the bulletin that refer to the triple flush have the same number but earlier dates.
Any dealer who is still doing the triple flush will likely have problems getting GM to pay for the second and third flush, so the customer may get just the first flush and not get the "blow out the lines" procedure.
Our 2017 Z51 A8 has about 20k miles and the transmission is working well except for the slight rpm variations in V4 mode that's normal. I don't like that the A8 is more troublesome than our previous A6 but so far it's operation in our car is just fine.
I'm not stating this as fact - rather, I'm just passing along what I heard. I haven't fact checked any of this. Felt it's worthy at least of mention to get some conversation going about it though.
I was talking to a tech that works at the local Chevy dealer as I sold him some of my old Camaro tires. He does a lot of the transmission work at this dealership- and was very familiar with the A8 issues. He mentioned that Mobil just released a new friction modifier package for their fluid - and he felt this was the real fix. His contention was that even using the Range Disabler, the way the transmission is programmed to shift (which is biased by gas mileage goals) it still causes the TC to go in and out of lockup. He said the new fluid's modifier was supposed to prevent TC damage from this. He advised me to be proactive and get the triple flush done now with the new fluid. He also told me that you have to check the date on the fluid to know if it has the new package or not. I asked if I'd be covered under warranty if I stated I had shudder issues when I walked in. His response was that unless he saw the shudder via some type of scanner - the warranty work wouldn't be authorized. That being said - being proactive would be 100% on me. I've done nothing with this - but I haven't heard of this change in the friction modifier package. He also said that his dealership is either still replacing - or back to replacing the TC when a customer comes in with confirmed shudder. No more triple flush.
Anyone else hear anything similar?
Originally Posted by 767guy
The Torque Converter is part of the GM power train 5 year warranty . If you have what you believe to be TC symptoms such as the feeling of driving over rumble strips there is a protocol that the service department must follow :
1) a tech will hook up his computer to your car and while doing a road test will measure Torque Converter Clutch slip and other parameters to confirm they are either in or out of tolerance.,
2) If out of tolerance they will do the flush procedure or go straight to a TC replacement which includes the new transmission fluid that became available very late 2016 or Jan 2017.
I see that you are probably in Florida for the winter as am I . Stingray Chevrolet in Plant City FL is one of the nations largest Corvette dealers. You can call them for verification of your concerns and warranty by speaking with Justin Lawson who is the Director of Maintenance and has a great deal of experience with these issues.For TC issues , differential issues etc, I would STRONGLY recommend you only deal with a large Corvette dealership.
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Can anyone give more information on how to identify the newest Mobil 1 ATF?
I'm thinking of getting the "flush & blow" done soon just because, and want to make sure I get the best fluid.
GM has mastered locating the shudder.
They use a vibration sensor attached to the rear bolt of the drivers seat.
The software can tell if the vibration is engine, transmission or tire/wheel harmonic.
Minimal shudder is not going to be addressed under warranty.
firstvI heard of this. Can anyone else verify this statement?
For those that may wonder which fluid to use for the A8...….Old TSB versions of NA-16-175 referenced the 'other' part number, not the '5656 one. Makes it confusing if you don't have a recent version of the TSB.
Last edited by kensredvette2; Sep 21, 2018 at 06:45 AM.
Doing the fluid change can be a DIY project. I did the change on my own as a preventive measure. Thank goodness no shudder yet on this 2016. Just make sure to have the section of the service manual handy for the correct procedure. It is unlike any tranny with a dipstick. It is not difficult, but must be carefully followed.
(The cute little fill adaptor GM part DT51190 is very handy for this job and I think it is a must have to make the task easier.)
I may do it again to better mimic the original 'triple flush' recommended by GM. GM now only does the single fluid change and cooler cleanout. The DIY cost for 3 changes is around the same as one at the dealer.
For those that may wonder which fluid to use for the A8...….Old TSB versions of NA-16-175 referenced the 'other' part number, not the '5656 one. Makes it confusing if you don't have a recent version of the TSB.
This is so unbelievably dumb that it could actually be a genuine GM document.
Two different fluids, not interchangeable, with the exact same name. The only way to tell the difference is that the stuff for our cars does not have a GM part number on the package.
I expect there are different Mobil part numbers on the package for both types of fluids, but would that be mentioned in the bulletin? Noooooooooooo…
EDIT:
Just got off the phone from Mobil. Explained the situation to the guy who put me on hold while he researched this. He came back and said that the higher level Mobil people say that GM has made a mistake, there is only one "Mobil 1 Synthetic LV ATF HP". He says the Mobil part number for that product (6-pack) is 122210.
Not sure who to believe at this point.
Last edited by Gearhead Jim; Sep 21, 2018 at 10:24 AM.
Doing the fluid change can be a DIY project. I did the change on my own as a preventive measure. Thank goodness no shudder yet on this 2016. Just make sure to have the section of the service manual handy for the correct procedure. It is unlike any tranny with a dipstick. It is not difficult, but must be carefully followed.
(The cute little fill adaptor GM part DT51190 is very handy for this job and I think it is a must have to make the task easier.)
I may do it again to better mimic the original 'triple flush' recommended by GM. GM now only does the single fluid change and cooler cleanout. The DIY cost for 3 changes is around the same as one at the dealer.
i’d Be interested in knowing more about the ability to do this myself. Can you provide more details, I do not have access to service procedures.
GM part DT51190
I am pretty sure you don't need this.
My mechanic said there is a fill hole like the C6.
From experience- GM part DT51190 would be good for the new Cadillac auto trans refill.
I have a bunch of vacuum fitting and just put one of them in the drain hole and pushed the new ATF back in.
I will do a video next month when I hit 60K miles showing step by step replacing the AT filter and fluid.
He covers the fill adaptor at 21:45 in to the video.
The fill adaptor is not needed, but it does eliminate the need to uncover the fill cover that is sometimes hard to get to. The fill adaptor allows easy fill through the drain plug hole.
