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I recently took my 2022 C8 with 3200 miles in for it’s 12 month oil change. The dealership is a Signature Corvette dealership, has Certified Corvette Technicians, sponsors a local Corvette club, and is consistently a top 100 dealership in Corvette sales. I elected to pay for this 1st year oil change myself and informed them I will save my “free” service for next year when I will be closer to the 7500 mile and 2 year point for my DCT filter change. This discussion led me to ask for confirmation that the DCT filter change would be done after the internal DCT fluid flush. That question was followed by a pregnant pause of several seconds accompanied by what I can only describe as a “deer in the headlights” look. I explained that, to the best of my knowledge, it is now a GM requirement to do the internal flush to try and trap break-in debris from the fluid and solenoids, into the filter prior to removing the filter, and that the whole flush procedure only takes about 10-15 minutes by use of a computerized GM scan tool program that is hooked up to the car and activates the solenoids, fluid, etc. Both of the Service Advisors informed me that they have never heard of the internal flush procedure, that they have done many first time DCT filter changes on the C8 without doing any internal fluid flush, and that it is just a remove and replace procedure. Obviously there was a disconnect from what I have been reading on this forum. Confused by what really is involved with the first DCT filter change I decided to call another dealership when I returned home, with equally impressive credentials as the first dealership, and was told the same thing, i.e., the initial DCT filter change on the C8 is a remove and replace procedure with no flush. Has anyone else had a similar experience as this? It’s also possible that many, if not most, C8 owners that have had the initial DCT filter change are unaware of exactly just what was done…flush, no flush, just remove and replace?
This leads me to ask, for all Corvette owners in the Twin Cities area, is there a dealership that you have found to be satisfactory in servicing, and hopefully up to speed on all procedures and GM guidance? I appreciate any and all inputs.
I recently took my 2022 C8 with 3200 miles in for it’s 12 month oil change. The dealership is a Signature Corvette dealership, has Certified Corvette Technicians, sponsors a local Corvette club, and is consistently a top 100 dealership in Corvette sales. I elected to pay for this 1st year oil change myself and informed them I will save my “free” service for next year when I will be closer to the 7500 mile and 2 year point for my DCT filter change. This discussion led me to ask for confirmation that the DCT filter change would be done after the internal DCT fluid flush. That question was followed by a pregnant pause of several seconds accompanied by what I can only describe as a “deer in the headlights” look. I explained that, to the best of my knowledge, it is now a GM requirement to do the internal flush to try and trap break-in debris from the fluid and solenoids, into the filter prior to removing the filter, and that the whole flush procedure only takes about 10-15 minutes by use of a computerized GM scan tool program that is hooked up to the car and activates the solenoids, fluid, etc. Both of the Service Advisors informed me that they have never heard of the internal flush procedure, that they have done many first time DCT filter changes on the C8 without doing any internal fluid flush, and that it is just a remove and replace procedure. Obviously there was a disconnect from what I have been reading on this forum. Confused by what really is involved with the first DCT filter change I decided to call another dealership when I returned home, with equally impressive credentials as the first dealership, and was told the same thing, i.e., the initial DCT filter change on the C8 is a remove and replace procedure with no flush. Has anyone else had a similar experience as this? It’s also possible that many, if not most, C8 owners that have had the initial DCT filter change are unaware of exactly just what was done…flush, no flush, just remove and replace?
This leads me to ask, for all Corvette owners in the Twin Cities area, is there a dealership that you have found to be satisfactory in servicing, and hopefully up to speed on all procedures and GM guidance? I appreciate any and all inputs.
I look forward to hearing the feedback you get from others on their experiences, and hope that yours are not the norm.
I am at the 1 year point. Hey today! Exactly! what a car. I love it.
A couple months ago I went to the selling dealership which is conveniently only 5 miles away. I talked to the service tech about the strategy of doing my own first oil change and waiting for the 2 year point so that I am closer to the 7,500 DCT filter change. The service writer agreed with the plan and agreed with the extension of the time period of the included oil change and DCT filter change. However he did not know if the DCT filter change included the flush. He asked the service manager and he abruptly and emphatically said NO! it is not included. There was no point in discussing at that point, he still has a year to stand corrected. In the meantime, I have collected procedures and documents to prove that step #1 of a DCT filter change is to perform the hydraulic flush procedure. I am prepared to discuss and walk away if needed if he does not perform the flush.
Yes very confusing? I sent an this question to Mary Barra’s email a couple on 9/30/22. I received a call back from a representative within 24 hours. The rep stated the flush is only included in the DCT filter change if there was or is an issue. CEL, shifting issue etc. email below.
Hello Ms. Barra,
First I would like to thank you for the 2020 C8 HTC your company built for me. It’s a fantastic vehicle. My question is about the 7500 mile transmission filter change. There’s been a lot of discussion about a mandatory flush being performed before the transmission filter change. My dealership stated the 8-10 minute flush to push any debris into the filter wasn’t necessary if there hasn’t been any issues with the transmission. Is this correct? I contacted GM customer service and they stated follow the recommendations of your dealership. I know of other C8 owners whose dealerships performed the flush even though their vehicles had no previously transmission issues. I want to keep my C8 in Tip Top condition so I am very interested in your reply.
Yes very confusing? I sent an this question to Mary Barra’s email a couple on 9/30/22. I received a call back from a representative within 24 hours. The rep stated the flush is only included in the DCT filter change if there was or is an issue. CEL, shifting issue etc. email below.
Hello Ms. Barra,
First I would like to thank you for the 2020 C8 HTC your company built for me. It’s a fantastic vehicle. My question is about the 7500 mile transmission filter change. There’s been a lot of discussion about a mandatory flush being performed before the transmission filter change. My dealership stated the 8-10 minute flush to push any debris into the filter wasn’t necessary if there hasn’t been any issues with the transmission. Is this correct? I contacted GM customer service and they stated follow the recommendations of your dealership. I know of other C8 owners whose dealerships performed the flush even though their vehicles had no previously transmission issues. I want to keep my C8 in Tip Top condition so I am very interested in your reply.
Well, that is interesting. If that is the case you'd think they'd have a TSB or something they could reference. If true, it would mean that the DCT filter change procedure that requires the flush as the first step would need to be tied to the VIN or something. GM should really come out with a written clarification on this.
Yes very confusing? I sent an this question to Mary Barra’s email a couple on 9/30/22. I received a call back from a representative within 24 hours. The rep stated the flush is only included in the DCT filter change if there was or is an issue. CEL, shifting issue etc. email below.
Hello Ms. Barra,
First I would like to thank you for the 2020 C8 HTC your company built for me. It’s a fantastic vehicle. My question is about the 7500 mile transmission filter change. There’s been a lot of discussion about a mandatory flush being performed before the transmission filter change. My dealership stated the 8-10 minute flush to push any debris into the filter wasn’t necessary if there hasn’t been any issues with the transmission. Is this correct? I contacted GM customer service and they stated follow the recommendations of your dealership. I know of other C8 owners whose dealerships performed the flush even though their vehicles had no previously transmission issues. I want to keep my C8 in Tip Top condition so I am very interested in your reply.
The rep should read their own dct filter change procedure lol
I recently took my 2022 C8 with 3200 miles in for it’s 12 month oil change. The dealership is a Signature Corvette dealership, has Certified Corvette Technicians, sponsors a local Corvette club, and is consistently a top 100 dealership in Corvette sales. I elected to pay for this 1st year oil change myself and informed them I will save my “free” service for next year when I will be closer to the 7500 mile and 2 year point for my DCT filter change. This discussion led me to ask for confirmation that the DCT filter change would be done after the internal DCT fluid flush. That question was followed by a pregnant pause of several seconds accompanied by what I can only describe as a “deer in the headlights” look. I explained that, to the best of my knowledge, it is now a GM requirement to do the internal flush to try and trap break-in debris from the fluid and solenoids, into the filter prior to removing the filter, and that the whole flush procedure only takes about 10-15 minutes by use of a computerized GM scan tool program that is hooked up to the car and activates the solenoids, fluid, etc. Both of the Service Advisors informed me that they have never heard of the internal flush procedure, that they have done many first time DCT filter changes on the C8 without doing any internal fluid flush, and that it is just a remove and replace procedure. Obviously there was a disconnect from what I have been reading on this forum. Confused by what really is involved with the first DCT filter change I decided to call another dealership when I returned home, with equally impressive credentials as the first dealership, and was told the same thing, i.e., the initial DCT filter change on the C8 is a remove and replace procedure with no flush. Has anyone else had a similar experience as this? It’s also possible that many, if not most, C8 owners that have had the initial DCT filter change are unaware of exactly just what was done…flush, no flush, just remove and replace?
This leads me to ask, for all Corvette owners in the Twin Cities area, is there a dealership that you have found to be satisfactory in servicing, and hopefully up to speed on all procedures and GM guidance? I appreciate any and all inputs.
In August 2021 my Trained C8 Tech showed me the GM proceedure for changing the DCT filter since I had it changed with the engine oil/filter when the OLM said 5% life left. That was based on time since I only had ~3000 miles. I read the owner’s manual which as all said need to change all 11 quarts of DCT fluid at minimum every 36 months so thought good time to change DCT filter again.
The GM proceedure per their electronic service info (for which dealers pay) said perform a flush toget any debris into the DCT filter housing and filter before changing filter. He connected his PC to my OBD port and to the GM service computer vis WiFi. It did all the work with engine running. Took ~10 minutes and last PC screen said “flush completed.” Could hear “things” happening. All on GMs dime.
This past August had the engine oil/filter changed on my dime. Discussed with tech next year (year 3) and the 11 quart DCT fluid change with new filter.
@Chevy Cust Svc If this thread is being followed along with the numerous others regarding the crossed info, yes to flush, no to flush and so on, could this be elevated to the highest level and make a statement to everyone? Please? We really need some clarity on this topic.
Yes very confusing? I sent an this question to Mary Barra’s email a couple on 9/30/22. I received a call back from a representative within 24 hours. The rep stated the flush is only included in the DCT filter change if there was or is an issue. CEL, shifting issue etc. email below.
Hello Ms. Barra,
First I would like to thank you for the 2020 C8 HTC your company built for me. It’s a fantastic vehicle. My question is about the 7500 mile transmission filter change. There’s been a lot of discussion about a mandatory flush being performed before the transmission filter change. My dealership stated the 8-10 minute flush to push any debris into the filter wasn’t necessary if there hasn’t been any issues with the transmission. Is this correct? I contacted GM customer service and they stated follow the recommendations of your dealership. I know of other C8 owners whose dealerships performed the flush even though their vehicles had no previously transmission issues. I want to keep my C8 in Tip Top condition so I am very interested in your reply.
Thank you for sharing. This lines up with what the GM techs on the forum have also stated.
Thank you for sharing. This lines up with what the GM techs on the forum have also stated.
@ChiTownVetteTech and @RichieRichZ06 are Corvette techs and have stated that the hydraulic system flush is a required part of the DCT filter change per the instructions in the system.
Thank you for sharing. This lines up with what the GM techs on the forum have also stated.
One GM tech also gave this misinformation. I can tell you all the techs that follow the gm filter change procedure know to do the flush. Its in writing.
All of our local dealerships know to do it and are reimbursed for it since its part of the written procedure.
Yet we've received clarification from Chevy above but that isn't valid? It's hilarious how over blown this procedure has become. Most the guys worried about it will never even see the first regular interval @ 22.5k miles. To each their own... It doesn't matter. Glad I did the track-fill and could careless how my dealer performed the initial 7.5k service since it was done on-time & documented as completed for warranty purposes.
Yet we've received clarification from Chevy above but that isn't valid? It's hilarious how over blown this procedure has become. Most the guys worried about it will never even see the first regular interval @ 22.5k miles. To each their own... It doesn't matter. Glad I did the track-fill and could careless how my dealer performed the initial 7.5k service since it was done on-time & documented as completed for warranty purposes.
If i had a dollar for all the misinformation I've received from the gm advisor line...
This isn't rocket science. Its part of the required service procedure. In writing. When its not part of it anymore it won't be required
And the ops question was answered
Originally Posted by Lawdogg
Miller Chev in Rogers. Ask for Ben to be your tech. He has done several 7500 mile C8 services and does the computer flush with filter change.
^^^
Agree. The service manager doesn’t care he gets reimbursed as if they took the time to do the flush
Techs typically work on incentive getting paid by beating GMs defined time for a repair or maintenance task. (Validated that with the service manager at the small dealership I now use.) Get done quicker, get whatever incentive pay and move on to the next job, beat that rate etc.
SIDEBAR
It was many years ago that my Uncle was service manager at a very large Chevy dealer in a big city (he later was GM when I tried to buy my 1st Corvette in 1974. Could not get one as GM was fully allocated. Was crazy year for cars as new EPA requirements had 350 cid Vette engine at only 195 hp and the 454 cid only 270 hp! Bought a Datsun 260Z!)
My Dad and I would do all the car repair work we could but if we needed a pro he recommended a mechanic he had that was very good and very meticulous. He told us to use him on the weekends at his home.
Recall he said I feel bad, he has 6 (?) kids, needs the money and can’t make it here since, although he is very good he is so slow! In fact, he said he might have to let him go as he was taking up one of his service bays and they could make more money with a faster mechanic.
Don’t doubt if it’s similar today! It is a business.
The plot thickens. I thought it was weird to change the filter and not change fluid. Computer solenoid cycle only if there is a problem? Hard to tell what that does anyhow.
I am planning to change fluid and filter at 3000. Maybe not necessary, but it cannot hurt to have fresh fluid in there. When the clutches break in, there has to be some fine dust particles expelled into the fluid.
I want to get that contamination out of there.
Keep in mind you are talking with "Service Advisors". Usually not the smartest bunch on the actual technical work that is performed.
If you ask them about a "flush", they are probably thinking like a radiator flush, or brake line flush, or tranny flush, etc etc and these are usually more labor and materials intensive so free flush? Hell no! They don't realize it is just a computer button push and an internal procedure of the DCT.
The corvette tech that works on my car told me that he runs the flush procedure before EVERY DCT filter replacement that he does. He let me stay in the service bay area and showed me how the scan tool works, how the flush procedure runs, etc.
DCT Fluid Flush Procedure Confusion
