I recently bought a '22 C8 with 12K miles. The records show that it had the transmission filter changed at 1500 miles. However it didn't have the filter changed at 7500 miles. So I am wondering if this will affect my warranty. I scheduled service to change the filter this coming Tuesday. What do you think? Will I have issues if I need warranty work?

 

Impossible question to answer and we will not know until someone is actually denied warranty due to not following the 7500 mile required service. My guess is that there is going to be a lot of C8's out there that miss the interval simply due to lack of knowledge both on the owners part and due to dealers providing wrong and misleading information on whether the service is necessary. If I was looking for a used C8 I would only buy one that has had all required maintenance done per the owners manual. I would also not buy one without a warranty.

 

Nobody knows...... All we know is that you are at risk - the manual is pretty clear on that. There have been no similar examples where a failure happened and a claim was denied. There was one thread where someone got to well over 10000 miles, then claimed he did not know he was supposed to have the filter changed, and he did have a transmission issue. He said he was told that GM might deny the claim. I don't recall that he ever finished the story.

From the 2022 manual:

"Damage caused by improper maintenance
can lead to costly repairs and may not be
covered by the vehicle warranty."

Later manuals added a more explicit warning specifically about changing the DCT filter.

 

Don't overthink it or stress about it... My personal opinion is that GM will be reasonable if an issue were to arise considering it had been changed twice within the first 12k miles.

 

Make sure the dealer follows the process for changing a filter that is past the 8000 mile limit. That process is to replace the existing filter without first doing the hydraulic system flush, then do the flush, and then replace the filter again,

 

The limit was 7500 miles or three years, which ever came first. Mine was time. With the Valvoline dct fluid I will change more often, to compare wear with oil analysis. You may not remember, but when the 2020 C8 came out, rock auto had the genuine GM dct filters for 39.99, then they were out of stock for a while. when the supply came back online. It went to the price you see now.

 

Limit on what? The requirement for changing the external canister filter is 7,500 miles +/- 500 miles regardless if changed earlier, then at 22,500 miles, then every 22,500 miles thereafter, or when the filter life monitor says so (if you have one), or every 24 hours of track use, whichever is first. There is no three year requirement for the filter. Other than the 24 hours of track use, there is no "time" requirement at all for the DCT external canister filter.

The requirement for the transmission fluid is change it when the Fluid Life System says so, or 45000 miles, or three years, or every 24 hours of track use, whichever is first. There is no requirement to change the filter at the same time as the fluid unless the the triggers are coincident.

 

7500 mile service - CorvetteForum - Chevrolet Corvette …

WEBOct 5, 2023 · You can change the DCT filter at 1,500 then 4,000 and again at 6,500, but you'd still need to change it again at 7,500. Keep in mind the DCT fluid is also required to be replaced every 3 years, regardless of miles.

 

As I write this I'm sitting at the dealer having full service done on the trans, fluid swap and filter. Bought the car with just over 12000 miles on it, three years and a few months into it's service life. Live in Phoenix, bought the car in LA, and drove back to AZ. Was always serviced at Van Chevrolet in Scottsdale, but the service department there could not verify that the 7500 mile filter swap was ever done, and I was actually told "we don't do that", meaning it wasn't part of their normal service interval for the C8. Of course, I thought, WTH?!, but whatever.....car has GMPP coverage that I'll be transferring over.

Made the appt for the day after I got it back here, and here I sit. I agree with the other posters here, as to who knows what GM will do until a claim is made. I figure, if you do your due diligence with dealer maintenance, document any self maintenance done, it will most likely work out.

Good luck!

 

WTH indeed. It boggles the mind. Although there is confusion on the hydraulic system flush, and on the three year fluid change, one item that has been perfectly clear and never changed in any of the Owners Manauls, Service Manuals, and Tech Links is the requirement to change the DCT external canisister filter at 7,500 miles. If they were the servicing dealer and can't verify that it was done, doesn't that mean it was not done? Is there is service record at all around the 7,500 miles mark? Sometimes the invoice and record is cryptic (I say that based on invoices posted on this forum) and will say things like "Perform 7,500 mile service" without detail. Given that they are cryptic like that, I would think any Chevy dealer record showing that would be adequate. What about the free service? Is there any record of that being used. I can look right on myChevrolet account, on line, and see a list of services performed by my dealer. Even as the second owner, I think you may be able to access that.

Attached is how my first service visit was recorded at 1 year and about 2500 miles. I opted to use the free service and the filter was change, along with the engine oil and filter. The invoice may show more detail, and the dealer may have access to that - I do not know. I have not yet acquired 7500 miles so I have not yet had the filter changed again. But at two years I did have the oil changed, and at three years I had the transmission fluid changed. I attached how that shows up in the record as well.

 

The service records show oil/filter at 4500, and another oil/filter at 9000. A misc service (not powertrain related, in between) sandwiched in there, and one additional oil chance 10 months later at around 10500. No mention of trans service. Pre-purchase inspection was clean, ran great from LA to Phx, and just got done with the full trans service a few hours ago. Service rep said car is “perfect”. Nothing to do now but enjoy the car and keep up with the required maintenance.

 

Interesting as many report that the dealer doesn't do any flush with a filter change...

 

Yeah, A lot of dealers don't bother to actually read the service instructions. In the current online service manual, the instructions I mentioned are the very first thing in the DCT filter change procedure, and are even highlighted in a red font to make them hard to miss.

People who follow the online forums are generally more knowledgeable than the service writers and techs at many Chevy dealers.

 

And yet, when I point out some well-known (here) fact to my service writer, he says with a scowl "did you hear that on the internet?" as if he clearly knows more than we do (he doesn't).

 

Yep, it's just an internet rumor that dealers should follow the instructions in the service manual...