So I took my 2020 c8 to have the trans filter changed and the fluid flushed and refilled. When I got home I looked at the bill I just paid and discovered they did the filter ($500) and did a 2 quart add to my old fluid (( had already paid a different dealer to add the 2 quarts in 2021 so I could track the car.
so now I have possibly 16 to 18 quarts of fluid in the Trans. The manager is telling me you can't overfill and to drive the 35 miles back so they can change the fluid like I asked but it's going to cost another $400. I already paid then $1170 for and oil change and the trans filter and 2 quarts add.
The manager says it will be okay to drive back and have them drain and fill it.
I'm worried it might damage the trans.
Mind you I was quoted $850 for the filter and trans fluid and $216 for the oil change.
I should have done all of this work myself! DEALERS SUCK!

 

This is why I plan on doing my own service. When I had my c7 the dealer over filled by 2 qtr my oil both times I took it in for oil changes. I changed my own oil after that.

 

Yeah, I do my own work as I don't trust the service at the dealers near me at all.

 

I do not know if a 2 liter overfill - over and beyond an existing 2 liter track fill - will cause damage, and I doubt your dealer know either. How would the dealer know

I can tell you what the Service Manual has to say about it, and its not encouraging. But I will point out - this caution statement appears in the Transmission Fluid Level and Condition Check which is checking the fluid for the normal track fill. But we know that its ok to put 2 more liters in for a track fill (for earlier models). We just don't know how much more before the events in the caution statement come true (if ever): "An over-filled transmission will cause fluid to discharge out the vent tube, possibly causing a fire that may result in serious bodily injury or severe vehicle damage, fluid foaming, or pump cavitation."

 

I'd be real reluctant to drive it with a 4 quart overfill. And if you choose to go back to the same dealer, I'd tell them (1) send a tow truck to pick up the car at their expense, because [quote the passage Andy copied, above] and (2) they need to subtract the cost of the 2 liter overfill they charged you for because you never asked them to do that, and you're not paying for work you didn't authorize.

 

A) why do I feel there is more to this story?
B) dealers don’t just add 2 extra liters of transmission fluid.
C) how would this dealer know the car already had an extra 2 liters of fluid installed.

 

^^^ I agree - there's definitely something fishy here.

 

I buy my oil from Rocksuto in the correct amount and take it to them. Can’t screw hate up…hopefully

 

My dealer stripped a bunch of the etorx heads off and the threads on one in addition to not putting the shear plate under the rear aero panel right, give them a chance, they will mess something up. And making a mess of engine oil over the shear plate.

 

Got a feeling from doing my own DCT filter change recently that when you remove the filter you are going to lose you two quart over fill. I lost about 1/2 quart on my 24 but I didn't have the over fill.

 

I don't think the overfill will drain out when you change the filter. You should only lose a few ounces of fluid, the amount the filter holds, with or without the overfill.

 

Correct

 

1st just because you had the extra 2 Overfill quarts added initially why do you think they took the trunk and intake air box out and spent ~2 hours accessing the factory fill location to add the two extra quarts? Unlikely and no legitimate dealer would add the fluid any other way (for safety reasons) other than the prescribed GM method!

Fact is there is no way to check other than to remove the check fluid level/normal fill plug and let whatever extra to drain out and start all over!

2nd adding the 2 quarts overfill does increase drag somewhat. Two more quarts just adds more drag. If driven without letting the engine rev more than needed to get there (probably won't exceed 1500 engine rpm) doubt it would do any harm. Look at Pics of what I estimate the DCT fluid is with 2 Overfill quarts. Far from getting near the top of the case even with 4 added.

SIDEBAR
In fact the 2 overfill quarts were probably not really needed BUT GM said must do for Tracking. Harlan Charles, reinforced by Josh Holder, recently said they were overcautious requesting the 2 overfill quarts as MOST Trackers would not ever have had fluid leave the fluid pick-up. Assume he means not aggressive enough to reach high lateral "g' on turns like the Laguna Seca Corkscrew where you are going downhill and turning aggressively (if your a very good driver and using racing slicks!)

Whole thing sounds fishy to me!

 

Jack the drivers side up 12” and check the side plug for the 2 liter over fill.

 

2. I should have looked at what the service advisor wrote up before they did the work. I did not know he wrote up " oil change, and add 2 quarts of trans fluid."
I asked for an oil change and trans flush and a new filter". Factory is i didn't even think to have the add the 2 quarts (i had that done right after I hit 1500 miles by another dealer back in 2020.)
3. Then, stupid me, when I picked up the car 5 hours later I didn't look at the paperwork because the total amount was approximately what I expected to pay.
4. In the end the manager had me bring it back and they did the flush at no additional cost.
I learned a lesson, read the work order (which I was not ever given) and read what they say they did before going home and reading it.
5. Did they really add 2 more quarts plus 1 quarts for changing the filter?? Who knows.
6. Go ahead, bust my *****!

 

Just a communication thing. Most service writers have never dealt with a DCT. A flush to them is drain the transmission and refill. To us a flush is a computer program that cycles the solenoids before changing the DCT filter and is part of the DCT filter change procedure along with checking the fluid level and running the leak check program. Since you had the extra 2 liters the needed to know as soon as they would take the level check plug on the side out your extra 2lt was going to spill out.

Communication...

 

That right. There is no such thing as a "transmission flush". There is procedure called Hydraulic System Flush. Ask for it by name, and make sure the service writer and/or the tech knows what you are talking about. Of course, it is step 1 of the DCT external filter change procedure - so you really should not need to ask for it - but unfortunately some dealer skip it. But there is also a level check and a Hydraulic System Leak test. We should not need to spell out the step for them.

But yes, you should read the service order too.

 

You'll only lose about 6 oz. Just don't remove the side fill plug to check the level, or you WILL lose the full 2 quarts.