c0bra C8

The transmission filter needs to be changed at 7500 miles, not the fluid. I've seen on the forums between $350 - 450 dealer cost for the DCT filter change. The filter itself costs over $100.

You can use your free service long before you hit 7500 miles. If you go in 1 year 1 day from purchase, the service will no longer be free.

c0bra C8

Saw this PDF on another forum. It's for MY 2021. Could be useful to bring along to dealer service.

JerryU

First I agree, if you have a need to change oil before the 7500/12 month GM requirement to make yourself "feel better" do it! But I agree I would not do it for the Trans as clutch wear and other particles will still be in the process of mating and creating whatever debris. Also adding two quarts IF you're not Tracking means a longer warm-up time and the proper trans temp is a key for proper performance. That's why it has such a large liquid/liquid heat exchanger. It get's coolant first from that returning from the front rads.

Now, there is a question IF the dealer can get reimbursed for the Trans filter change at 12 months IF the car only has 4,000 or 5,000 miles. That is probably what I will have and will have the dealer try! They will be sufficient miles, IMO, that whatever clutch plate wear is going to occur - will. We'll see.

AzDave47

Nice DCT cutaway drawing, JerryU

RKCRLR

I wish GM would provide the minimum miles necessary to complete the DCT break-in for the filter change that would satisfy the warranty requirements. In this environment I'm probably not going to get close to 7500 miles in a year. It's possible that the break-in is complete within the first 500 miles but they wanted to make the DCT filter change coincide with the first engine oil change.
At the very least, give me the DCT filter when I bring it in for the engine oil change and let me install the filter when the break-in is complete.

/Bear/

Interesting point!

I watched an Emelia Hartford video in which she and her crew disassembled the DCT out of her souped-up C8, and she expected the clutch plates (seen in that great photo you posted) to be smoked because of all the extra HP her car has and how hard she'd pushed it, but they looked new.

919cw313

Where is this mileage limit stated?

johnodrake

I intend to do my freebee at close to the one year point and have them do the DCT filter at that time as well - since it is FREE (I like Free). I will do the DCT filter again at 7500 miles. I will also have the dealer add the additional two qts of oil to the DCT - unless we find that that adversely affects mileage in some way. That will surely come up on the forum as members get more data.
I will be surprised if I have 2000 miles a year on the car. So it will be 3 plus years for me to 7500 miles. I may wind up doing the DCT filter at the same time I do brake fluid flush every two years.

JerryU

I don't think 500 miles would be enough. Look at the cutaway I posted and the number and size of of clutch plates and friction disks. As someone mentioned, when stopping the slippage (that occurs when below 3 mph) gets smoother even past 1000 miles. I notice that at 1500. They have 7500 miles for a reason but as I said, hope my dealer can get it paid for at the ~4000 I'll have at 12 months.

I tried to get a free oil filter for the first change in my 2014 Z51 (because could not get the proper filter at AutoZone etc, that day) As The Parts Manager said, it only is "free" if they do the service and provide GM with a signed service order! Best I could do was a 35% discount! I did all my own oil changes in Vettes but will let the great Corvette etch at the Courtesy Deliver dealer do the C8.

c0bra C8

Not sure it is explicitly stated by GM anywhere. I'm going off advice by some longtime Vette owners.

Best to check with Service Advisor at the dealership if you plan on hitting 7,500 miles. I'll be lucky to see 5,000 in a year.

LJT

I will change my own oil & filter & DCT filter. I already have the fluids and filters.

919cw313

So only rumor or opinion, despite being presented as an absolute truth. Got it.

Phil1098

Um, it's in black and white in the form you posted in post# 22. There is no mileage listed.

aroach

manual trans.

RKCRLR

That's why I wish GM would provide the minimum mileage the DCT filter can be changed and still maintain the powertrain warranty.

919cw313

Ask Tadge topic?

RKCRLR

Perhaps, but seems a little trivial for an Ask Tadge topic. I'd ask about the water in the shock towers first.

I'll give the Corvette Concierge a try first and see if anything comes of that.

919cw313

Yeah, it's probably below his pay grade, but way above CC's too. I suppose the correct route to take would be to ask your local Chevy dealer's service advisor, who should ask his service manager, who should consult with the GM area rep. That would require a customer who knows how to talk to people and a service department willing to do their job, so results may vary.

Phil1098

I've never heard of a warranty being denied because someone changed filters too often.

RKCRLR

I think you're misunderstanding what I'm asking.
Let's say I only get 2000 miles on my car this year before I need to do the first engine oil/filter change and I also have them do the DCT filter change. I don't do my next DCT filter change until I've put another 22,500 miles on my car, and then every 22,500 miles after that (or when the life monitor tells me to).
Have I met my DCT maintenance obligation for the powertrain warranty?