Yep at 83 still changing the oil in the 8.2 Liter engine in my street rod! But when I got my 2020 C8 found a dealer with a great C8 Trained tech and knew the DCT filter was to have a flush prior to changing. Prior to finding this great C8 Trained Vette Tech I changed my own oil in two C7 Dry Sumps because I didn't trust the large Chevy Dealer in town with >30 servcie bays who had one for oil changes usually staffed with a newbie Tech who may have been flipping burgers the month before!

So no question now have the great tech do everything. Only one at that small dealership who touches the Vettes for anything.

Although with a Lift it's not hard. BUT have to buy a special tool to do the flush GM specs say should be done prior to a DCT filer change to get any internal debris into the filer prior to changing. It's done at the dealer by the GM Service Computer connected to your OBD port via a PC and WIFI to GM. Tanks ~10 minutes.

Up to a recent post by @Andybump the internal filter was not to be changed except IF servicing the DCT. Not so easy as outlined by the Tech that works with Rick Conti, Chuck in a video. He noted he had to drop the DCT slightly to get access to the DCT pan bolts. Always a risk of leaks once removing and replacing the pan and gasket. But now Andy indicated a change is recommended at (I don't remember the miles) BUT it had been a lifetime filter.

Yep the Corvette had a Maintenance Table up to 2022/23 and it was clear the DCT Oil was changed based on miles OR Max every 3 years whichever occurs 1st. That has not changed thru 2026 BUT now have to find the words in several places. Crazy. No mention even in the latest Owner's Manuals of changing the DCT internal filter as I recall!


Posted these Pics in another thread to emphasize IMO how foolish it was for GM to eliminate the Maintenance Table that had been my 1st 6 Vette Owner's Manual including my 2020 C8!

I clearly says DCT fluid must be changed 45,000 miles OR minimum every 3 years in the footnote.
Can forget my info in Red & Purple suggesting how GM could improve the way the footnotes are worded to say WHY there are some requirements. Like the every 3 years minimum for DCT Fluid AND for the engine oil at least every 12 months.





This is what you have to do to find the DCT fluid change requirement in the 2024 C8 Owner's Manual that included my E-Ray. If you don't catch the words on page 317 you would NOT know it is required to change DCT Fluid every 3 years minimum regardless of miles. And with all these words NO indication of why!
GM should make their Owner's Manual writers take the web course I just did as required for volunteers like myself who write our tech society standards for Requirements for welding airplanes, bridges and many other critical items!

 

I did find out that my external filter was changed at 1200 miles. Makes me think it could have had a shifting issue or something else. The fluid was not changed at that time. I have 5300 miles on it now so I'll have the external filter changed again at that time. I bought it with 3300 miles and it was already over the 3 year max on the fluid change, I guess I should go ahead and have it changed even though the filter was changed at 1200 miles.

 

Jerry, I don't recall ever saying there was recommend routine change indicated. As far as I know there is no routine replacement for the internal filter. Its only called out in diagnostic procedures as an attempted remedy for a transmission issues before more drastic steps such as component or transmission replacement. In one post I did say that I wondered if it really is a lifetime filter, but I don't recall saying there was any recommended replacement interval - I do not think there is.

As for "dropping" the transmission slightly.....I'm just do not know either way about about about that. I have seen several posts that say thee is an issue with a cross member, but I don't recall anyone saying the transmission had to be dropped (slightly or otherwise). The 2020 version of the procedure for the internal filter replacement does not specifically mention the issue. But my understanding from other posts by those who have done it, is that there is a cross member that blocks access to some of the pan bolts that must be dealt with. Later versions of the procedure may give more detail, but I don't have access to that. I thought at least one poster said there is a way to get to those pan bolts. Something may need to be moved, but I'm not sure it requires "dropping" the transmission. Someone who has done it needs to say.

 

^^^^
Sorry, thought there was post where you quoted one was called for. But just looked and you were quoting several procedures where with other work it was called. for.

So looks like there is no specified requirement, in essence it's a life time filter if no internal work is ever done on a DCT.

 

I took advantage of the GM free DCT filter change year one when I had ~3000 miles on my 2020 C8.
My reason was two fold:

• 1st, a number of posts where folks with few miles had DCT CELs. Their Dealer Tech called GM Service with the CEL number (there are some 100) and GM Service told them just to run a Flush. No fluid is used or added and no filter was changed. For most the CEL was gone and did not return.
• My 2nd reason was when crawling into my garage to keep my driver's mirror tip to wood molding to about an inch I travel at ~2 mph. Up to about 1000 miles it was a bit jerky. After ~1000 it was perfectly smooth. Thought that was probably the high spots of the multiplate 1st gear (and other odd gears) clutch wearing. Up to about 4 mpg that clutch must slip or the engine would stall. Thought might as well get the Flush GM specified in the procedure prior to the DCT filter change.

Get zero credit for an early DCT filter change. MUST still change at 7500 miles (+/-500) narrow window to maintain DCT Warranty. So year 3 with the required DCT FLUID charge I had the DCT filter changed again with just under 8000 miles. Frankly in your case believe I would wait for 7000 miles as if you change at 5300 miles you'll have to change again at 7500!

 

Quote
Get zero credit for an early DCT filter change. MUST still change at 7500 miles (+/-500) narrow window to maintain DCT Warranty. So year 3 with the required DCT FLUID charge I had the DCT filter changed again with just under 8000 miles. Frankly in your case believe I would wait for 7000 miles as if you change at 5300 miles you'll have to change again at 7500!

Yes sir, that's my plan to have it done at 7500 miles. I meant in my statement I had 5300 and I'd have changed again at 7500. Should have worded it differently.

 

I have a 2020 stingray and I contacted Foxwell to see if the NT710 would do the transmission flush. They asked for my VIN , and then confirmed it will do the transmission fluid/filter flush

 

I believe you can get to the pan bolts without moving the engine/trans. I recall Chuck (Conti's Chuck) doing it. The internal filter "looked" brand new. As mentioned, the sump filter is a lifetime filter unless there was some internal damage in the DCT that dictated an sump filter change. I have no intention of replacing it. The risk of pan leaks and the PITA removal isn't worth it to me.

 

Yep what Chuck said in that Video where "he told Rich" there was no need to change the internal filter was you need to loosen the DCT mount bolts and drop it slightly to access all the pan bolts.

Rick Conti Video's are not the normal Youtuber who just starts rambling on! His are well done and no doubt follow an outline or Story Board (didn't say he was always right but think Chucks info is usually very good.). IMO Rick was ready to sell his C8 and buy another and wanted whoever might buy it to think he went overboard (which he did!) Yep if I worked at a dealership and got most service at very cost I would do that as well!