Well... here's my minor quandary. I have a 2020 and at the time GM's policy was 1 yr or 7500 miles, whichever comes first. Staying within GM's guidelines (at that time) I did the GM freebee at 4800 miles. At that time I asked the dealership if I need to change it again at 7500 miles. They emphatically said no, you're good to 22,500 miles. I understand that they don't block warranties, GM does. I also know the risks involved in not changing again at 7500 miles. This coming September is my 3 year mark and have scheduled a engine oil/filter change, a DCT hydraulic flush, DCT filter/fluid change with my dealership. I currently have 7300 miles on the car. My quandary is, Do I wait till my September appointment which I will probably have +/- 10,500 mile on the car or schedule the entire service earlier so I can be within the 7500 mile guideline. I won't breakup the service and will have all it done at one time. Having a degree in Automotive Technologies I know that more than likely the majority of the clutch friction material was released by the 4800 mile mark, which I accomplished the DCT filter change. That being said, I personally feel confident that doing it around 10.5K miles wouldn't provide any filter clogging risk. I know, I know, GM doesn't always follow common sense rules. I'm considering calling the dealer to advance my service so I can remain rock solid within GM's guidelines. I bought a 7 year GM platinum protection plan at the 2 year mark so I now have 9 years total of protection. I really don't want to jeopardize that. Thoughts?

 

I would just re schedule for 7500 and move on. You'll have piece of mind know you're within the recommended schedule, and you wont have warranty problems in the future (hopefully not needed).

 

You have a 9 year warranty. You don't want to jeopardize that. Do each required maintenance item when the schedule says to do it - even if that means separate trips to the dealer.

And to clarify GM's original policy. Unless I'm mistaken, that original policy was for the one time freebee. At that time, you could only receive your freebee within one year. It did not mean you could circumvent their maintenance schedule just because you hit the one year mark and received your freebee. If you received your freebee at the one year mark and had significantly less than 7500 miles on your car you should replace the DCT filter again at the required maintenance frequency. That being said, who knows what "significantly" less than means. But 4800 is probably in the range where you should change it again at 7500 just to be on the safe side and protect your warranty. Lastly, take what the dealer says about this with a grain of salt. It is GM that will deny the warranty, not the dealer.

 

Thanks Dave. But I appear to be in a unique situation. I have always changed oil in all my cars at 3000-5000 miles and always gotten 200k out of the cars without major repairs. So when I took the Corvette into the Chevy dealer at 5200 miles they changed the oil and inspected the car. No charge. There was no filter change at that time and now I have the warning on the dash and am taking it in for service Wednesday. My position is clear. You promised me, in writing, that you would install a dct filter for free. I am here for the promised service, for free.

Bill

 

If you change the fluid and filter now, between 7300 and 7500 miles, you avoid any risk of a denial of a warranty claim - should you have a transmission issue. The outcome if you wait til 10500 is something we can't predict. It clear that GM will review the maintenance record and may deny a claim if the determine that the requirements were not followed. I would be changing it at 7500 miles.

At least one forum member has it in writing from the concierge that 4600 miles was ok - and it does not need to be changed again at 7500. But when does it need to be changed then? I got scolded in this thread for pointing out that if you choose to roll past 7500 miles because you changed the filter early, you still should not go another full 22500 miles. But if one is going to go that route, and get something in writing, I would suggest something specific about when the second filter change must be done as well.

 

I got it in writing from a Chevrolet Customer Support "Specialist" that if I changed my DCT filter at 4600 miles I don't need to change it again at 7500 miles. I need to subtract 2900 miles (7500 - 4600) from my next scheduled DCT service and have it changed then. I talked to my dealer about this and he said to go with what the Chevrolet specialist told me - they didn't have any better information.

However, this was before the TSB about changing the DCT filter was released. I need to bring my car in for some minor warranty repairs and plan on discussing it with them again.

If you had your DCT filter changed "early" and don't plan on changing it again "at" 7500 miles I suggest you get something in writing from GM stating that is OK. If enough people do this perhaps GM will come out with a better definition of early. It also would be useful to other people if you posted your results on this forum.

 

Yep, do what I am doing!

Year 1, ~3000 miles had both engine oil and DCT filter done August 2021 ~12 months old on GM's dime. DCT filter with flush mostly precautionary because of early DCT CELS by many posters, cleared with flush. AND I understood year 3 all 11 quarts of fluid needed changing.

Year two, this past August paid for engine oil change.

This coming August, year 3 with ~10,000 miles will have engine oil, DCT fluid AND a new DCT filter installed. Good enough for me at I'll have ~6500 on year 1 new filter. also won't have ~7 oz of old fluid in filter housing when 11 quarts new added. Not a big deal but better.

Heck they have to remove the aluminum aero panel to drain the DCT so why not spend the extra bucks and get a new filter. At that poin is remove 4 bolts right by where they will fill! That 11-quart change will not be cheap!

 

opinions are like xxxxx

just change the fluid and the filter at the same time since you are at the or near the 3 year mark..

otherwise you could take 4800 miles add 7500 miles and change the fluid and filter together at a safe 10k miles.

I think the forum is filled with over zealous sticklers that have the best intentions.

if you are concerned then contact the corvette GM rep on the phone and they will offer a text conversation for your records should it come to that which it wouldn’t.

or just change the fluid when you change the filter.

if the fluid had to be changed the first 7500 miles and you did it at 4800 miles at the very least if you changed the filter less than 7500 miles from the 4800 miles because you were swapping out the fluid… isn’t it logical 7500 plus 4800 equals 12300? You are changing your fluid before that mark anyway and I assume you are going to change the filter at that point too.

did said transmission filter ever travel more than 7500 miles in the car without being changed? No therefore your maintenance surpasses GM requirements for warranty coverage.

personally I think the forum Nannie’s are over doing this story line trying to be over protective.

If it were me since you are changing the fluid in or around September…and you’ll have travelled less than an additional 7500 miles before then..

just change the filter and fluid at one time and if your worried…do the fluid and filter in July or August..


I doubt you would void your warranty for changing the transmission fluid and filter at 32 months instead of 36 months

i understand your concern to maintain the warranty on the 20 grand trans…

forum members will swoop in to say if you change the fluid before 36 months GM will void your warranty too.

good luck and just my opinion

 

I think that assumes that all of the break-in wear debris accumulation is finished before 4600 miles, doesn't it? You probably recall that I modeled this assuming that the rate of break-in wear debris accumulation falls off exponentially such that the rate at 7500 miles is 1% of the initial rate at 0 miles. With that assumption, and a first change at 4500 miles, it predicts that the filter will reach its maximum safe fill again at 26250 rather than 30000 miles. That's 3750 less, rather then 3000 less that would be calculated if all the break-in debris was done before 4500 miles. It gets better if break-in wear debris rate falls off faster, and worse if it falls off slower. I have no idea how it actually falls off. And that's sort of the point. Regardless of whether its a mathematical model, or gut feeling about it, we are making assumptions about how that break-in wear debris accumulates, and then trying to predict when the next filter change should be if it was changed early.

 

I agree and won't do the full 22,500 miles before the next DCT filter change. The technically correct answer is somewhere between an additional 7500 miles and an additional 22,500 miles since the first DCT filter change. I'm hoping more information comes out on this and make my decision then. And my decision may be to use what you put together as a guide. A conservative interpretation would be to assume the debris generation is constant to 7500 miles and then drops to normal generation. That says I can go another 13,800 miles before I change the filter. Or I could assume the generation reduces lineraly to 7500 miles and get more miles.

There are two aspects to this, the technically correct requirement and the requirement to protect the warranty.

The requirement to change your DCT filter again at 7500 miles even if it was changed at 7000 miles defies common sense. The DCT filter should be good for at least an additional 7500 miles and probably much more. Every since I can remember it has been accepted interpretation of the manual that if you do a scheduled maintenence early you just add the maintenance interval to your mileage and perform the next maintenance at that point. That is the technically correct answer.

To protect your warranty you need to follow the maintenance schedule. Since the DCT filter replacement intervals aren't consistant and can be can be interpreted differenty from what is customary I contacted a GM representative for clarification on my specific circumstance and was told that I'm good until my next scheduled maintenance interval. That protects my warranty.

 

You are correct, what you have posted is just your opinion, and may not be the best advice. What I and others have posted are fact according to published GM information. I must assume you didn't read the entire thread or you would have seen the link to the GM Techlink article which clearly states:

The initial filter change should be at 7,500 miles (12,000 km) and then at 22,500-mile (36,210-km) intervals.

Recommended miles intervals should be followed. If a customer elects to have the filter changed before 7,500 miles (12,000 km), it should be changed again at 7,500 miles (12,000 km). Check the maintenance schedule in the appropriate Service Information. (Fig. 5)

TIP: Filter change information should be shared with your service advisors and service management. GM will be reviewing maintenance records on transmission warranty claims. Lack of maintenance on the canister filter cartridge may affect warranty coverage.

For the entire article, go to the link below:

https://gm-techlink.com/?p=17254

 

your advice is just an opinion too. The advice given to the gentleman makes sense. If he changed the filter at 4900 miles..and he changed the filter a second time at an odometer reading of 10500 miles in September if I’m reading this correctly he is still changing the filter within a 7500 mile requirement . He is just doing it a second time when he has the fluid swapped out.

to the gentleman concerned call the 1800 customer number listed above in this thread. They will eventually give you the option while on hold to text to the GM representative. Specifically lay out your questions and get responses. Screen save the texted answers

if that doesn’t make you feel comfortable then go to the dealer and tell them to change the filter out again at 7500 miles. It’s only a couple of hundred bucks and if you have the GM card you can use that to pay for the second filter.

if it were me as I don’t love going multiple times to a dealer month after month. I try and combine services in one shot so I don’t have to go quite as often, I would change out the fluid earlier than 3 years by a few months etc and change the filter at the same time unless of course these geniuses on the forum have a problem with warranty coverage if you don’t wait exactly three years to change out the fluid and replace the filter.

then just follow whatever the fluid change out procedure is in the future every whatever the hell is called for.

same for the filter.

In my opinion pshycos on the forum are trying to create a problem for you to worry about.

could I be wrong? Absolutely …but I don’t think so. They are in my opinion being ****.

 

He didn't post an opinion at all. He posted GM documents on what the requirement is.

It clearly states in the manual it must be changed at 7500miles after break in. It doesn't say change it early and then change it after another 7,500 mi or change it early and then change it a little earlier than the 22,500 miles or any other schedule that people decide they want to make up on their own. It says change it at 7500 miles. Period.




GM tech link even further clarifies if you change it earlier it still must be changed at 7500 miles.






Now if someone decides to interpret that differently than what it actually says that's one thing but there's no opinion there it's very clear.

 

Thanks, appreciate your response.

 

do you work for GM? I think you and quite a few others are taking this a little too far.

if you use common sense I seriously doubt GM is going to void your warranty.

the GM representatives gave written insight. If you feel that’s insufficient than go change your filter again at 7500 miles. It’s all of a few hundred dollars.
lots interval time frame. Not exact mileage requirement

thanks for sharing your interpretation.

7550: 15000 then 22500 . If you change the filter at 5000 instead of 7500. Then according to the GM representative theirically you can go another 15000 from the 5000 miles and change the filter again.

he is changing his fluid at or near the three year mark so change the filter at that time.

if you are worried change the fluid and the filter early and calculate the future off that mileage and time frame following the suggested stated mileage and time in the owners manual.

this is ridiculous that forum members here are so ****.

what about all the owners who don’t even come to the corvette forum.

denying warranty claims because people changed their filter early is never going to fly in a court nor in the court of public opinion which is even more of a concern to the corporation.

the transmission cost 20 grand to replace while the negative publicity of what you are proposing would cost the equivalent of millions in bad public image

if you are worried changing the filter is cheap.

you could also buy one for 101 dollars at rock auto. Shove it in your closet and keep the receipt.

if GM warranty tried to deny coverage pull out the receipt and say you had a local mechanic replace the filter…

they can’t prove otherwise,

let’s use common sense and stop trying to make everyone as **** as you

 

All these miles/times are an approximation with a lot of safety buffer built in. It's not like the car will grenade itself if you get to 8000 miles. Probably won't grenade itself ever if you wait 3 years to do this stuff. It's just not optimal.
Further, it's overkill to say you HAVE to do it at 7500 even if you did earlier? How much earlier? What about 7499? Do I need to do it again? Are we saying that the Vette is operating at the razor's edge in terms of fluid tolerance? I doubt it. It's probably engineered to tolerate the worse kind of customer who forgets about maintenance altogether.

 

I literally only posted exactly what GM's guidelines are. I took it as far as your warranty book.

If you think that auto manufacturers do not reject powertrain claims if you do not follow the service schedule that is indicated in your book you are absolutely mistaken.


Again I gave no interpretation whatsoever I posted exactly what your warranty book and GM require.


I have seen more customer service chatbot Representatives make mistakes then not. Their response is completely inconsistent with your own warranty manual and what GM stated in the tech link. I would strongly suggest that everybody get that in writing if you are going to deviate from what is already in writing from GM. Relying on somebody else's customer service chat instead of your own service manual may or may not absolve you from failing to follow said service manual.




Can you please post anywhere in your servicing manual which is a legal document for what you agree to do in order to receive warranty service where it states what you just stated above...

.. or did you make that up grade upon what you think is acceptable? ... because I don't see anywhere that GM says that is acceptable?

Can you link us to where that is in the manual?


I don't believe anybody on this entire thread has talked about GM denying warranty because of changing the DCT filter early.

You can be denied a warranty claim because you do not follow the maintenance schedule.

There is absolutely nothing wrong with adding services.

But changing the DCT at 4,000 miles and then waiting until 15,000 miles is not changing the DCT filter early.

It is failing to follow the required 7500 mi DCT filter change requirement. It's really that simple and it's really what your manual says and it's really what tech link says.


Now for some reason if you decide that your own interval is better that's well and dandy but just know that you have deviated what is required in order to maintain warranty.

 

follow JerryU s example . It’s perfect.

the others on the forum are being **** and ridiculous.

 

And yet there is a not a single piece of documentation from GM that supports this interpretation.

It's also contradicted by your own service manual.

Bad advice.

 

You seem to have clear picture of this. The problem arises when folks that drive low miles have the filter changed early because the free service is about to expire. So, these are not unreasonable examples. At each of the following miles for the first filter change, what is your suggestion for the second filter change:

If the first filter change is at 1500 miles the next filter change should be ........
If the first filter change is at 2500 miles the next filter change should be ........
If the first filter change is at 4500 miles the next filter change should be ........
If the first filter change is at 6000 miles the next filter change should be ........
If the first filter change is at 7500 miles the next filter change should be at 30000 miles. (22500 miles later)