I apologize if this has already been discussed. When I first purchased my 2025 I was told and I think the warranty section in the app said the service had to be done prior to 3yrs and mileage between 7,000 and 8,000.

i just looked at my warranty in the app and it 12/29/2027 (3yr anniversary) OR 8,506 miles (my paperwork said odometer was at 5 when I purchased it).

I had been concerned that I might not get to 7,000 miles within 3 yrs, but I guess I don’t have to now.

am I reading this correctly?

 

DCT warranty still says 7,500 +/- 500. GM may pay for it up to 8,500 but by then technically you didn't follow the warranty requirements.

 

How could it not be under warranty when the information in my app is in the warranty section?

 

It's confusing. The DCT filter change is covered by its own warranty. The DCT itself is covered under 5 year/60,000 mile powertrain warranty. It has a hard requirement to change that DCT filter at 7,500 miles, +/- 500. Will GM throw a fit if you run it to 8,500 - who knows. But they are quite clear as to what the filter change intervals are. Were it me, I would not ignore the official change interval of 7,500 +/- 500.

 

You don't think you will put 5,000 miles on by the end of next year???
Once you pass 7000 miles, you will be in range of the required filter change of 7500 + or - 500 miles.
I think the 8506 mile statement on the app is just an error.

 

I have 3 vehicles to drive plus my wife’s.

the corvette also has summer tires so sees limited use from Nov to March.

 

The maintenance schedule is entirely independent of the terms of expiration of the "free" DCT external canister filter change.
The maintenance schedule say you must change the DCT filter between 7000-8000 miles even if done earlier.

The terms of expiration of the included DCT filter change are three years or (in your case) 8500 miles, but per the bulletin that dealers received, you must have at least 7000 miles to claim it. The expiration terms for the free service appear in the "warranty section" of your account because it is billed as a warranty action. If you look at your free engine oil change in the warranty section you have 2 years to claim that but there is no mileage limit, right? But you must still change your oil at 1 year or when the oil life system tells you in order to comply with the maintenance schedule. Doesn't mean you can wait 2 years to change the oil.

I had to change my fluid at three years - and before I had 7000 miles. Then when I was between 7000-8000 miles I had the filter changed.

 

I got the free engine oil change but dealer refused to change DCT filter for free since I was not at 7500 miles. Which I would not make in two years. Basically you can get a free oil change within two years but only the DCT filter if within the 7500 miles. And the service must be done at the same time.
Quite the rip-off in my opinion. In theory I paid for something that was refused by the dealer. And based on conversations at the time this is acceptable practice by dealers for my situation. Your trans oil change has a hard time limit of three years. I can't recall the mileage limit.

The letter I received from GM (Oct 24) says the trans oil is mandated at three years independant of the DCT filter. You can change the trans oil without filter change, then filter change once you hit 7500 +/- 500 miles. That is nonsencial to me. I need another 200 miles to hit the 7000 mark for my three year time limit. I have until Sept. so should be good to go. Once i hit that I will get service if I can find a good dealer in Atlanta. Not impressed with local service.

I have a 2023.

 

For 2020-2023 there was absolutely no mileage limit (minimum or maximum) for claiming the combined free service (engine oil change and DCT filter change), but you did have to claim it within 2 years. I claimed mine at 1 year and 2500 miles. Many others did the same thing. Starting 2024, and ONLY applicable to 2024 and later, the services were split. There was a 2 year time for the oil change with no mileage limit. There was three year time for the DCT filter change but you must have 7000 miles to claim it. None of that was applicable to prior model years. The attachment is not applicable to 2020-2023 vehicles.

 

In my case I HAD to conduct both free services within two years at the same time, time limit for engine oil and mileage for DCT filter. This according to the dealer but not according to documentation I had in another customer letter from GM. GM only had the time limit and concurrent service for both, engine oil and DCT filter. The dealer added the requirement for mileage for the DCT filter which was NOT stated in the GM letter. When I pointed this out to GM they just shrugged their shoulders.

Is it materially important to the performance of the tranny, no. Just another example of GM setting an expectation in writing and the dealer ignoring GM and getting away with it. Thus my concern of just how good the service will be from this same dealer.

 

Yep for my 2020 C8, end year 1 I took advantage of the free Engine oil/filter AND the FREE DCT filter change, witch at the time required a Flush.

Frankly I did it mostly to get the Flush as a number of 2020 C8s got DCT CELs at pretty low miles. When the dealer Tech read the DCT CELL # to GM Service they were tolkd to JUST do a Flush, no filter of fluid change. The FLUSH makes it sound like fluid is changed BUT it's not. The Tech showed my what the GM Service Computer said, which was the flush gets and possible debris (assume in solenoids, hydraulic actuates etc ) to go into the DCT Filter housing and filer BEFIRE the filter is replaced. It is done by the GM Service computer which raises the engine rpm to 2000 and you can hear "stuff" cycling. I watched the Tech's PC screen which was connected to the OBD port. After about 10 minutes it showed Flush completed. Most who had DCT CELs posted the Flush removed the CEL and it did not return.

As you note there were NO miles limitations on getting the free engine oil change OR DCT filter. Dealer was rembursed by GM. You had to use or LOSE the free offer within 2 years.

For my 2024 E-Ray the free oil change could be done separately within two years, no mileage limit. I had mine done year 1 with ~3500 miles. BUT the filter could not be performed FREE until the car had 7000 miles minimum. The dealer would NOT be reimbursed by GM if he did. BUT GM extended the 2 year free offer to 3. Since I drive my AWD 2024 E-Ray more then I did my 2028 C8 Z51 I had close to 7500 miles year 2 so took advantage of the FREE DCT filter offer. If I still have my 2024 E-Ray in 2027 when it will be 3 years old I'll have to pay for the DCT Fluid change. Perhaps I'll be lucky and get my planned 2027 Grand Sport X and let the next owner pay for the DCT Fluid change.

 

Yes, for 2020-2023 the free services were combined and everybody had to complete them at the same time. This is because for 2020-2023 there was a single, one time use chargeback code for the combined services. But there was no mileage constraint on when the combined free service could be claimed ever for 2020-2023 models. Dealers that say that for 2020-2023 are incorrect.

I don't know anything about a letter to customers concerning the terms of expiration of the "free service" that you mentioned.

I did receive a letter clarifying the maintenance schedule, which I attached. It has nothing to do with terms of the free service.

 

^^^^


I never received the letter many did from GM. BUT when it did come out it just stated what was already stated in the Owner's Manual. The +/- 500 miles max allowance on the required on the DCT filter change was known 1st from a Bulletin but clear when I had my 3 year service in August 2023. In fact well before, which is why I waited just before I reached 8000 miles in year 3.

I did take advantage of the free engine/oil and free DCT filter (with required flush) end year 1 with ~3000 miles on GM's dime. BUT known then there was ZERO warranty benefit from an early filter charge still required another on mt dime at 7500 miles.