This month my 2023 C8 turns 3 years old and has 5900 miles on it. Has the 3 year DCT oil change requirement changed over time and can I delay the oil change until 7500 miles to when the filter must also be changed and still maintain my warranty?

 

GM doesn't provide a tolerance on the 3 year requirement. Theoretically GM could void the DCT warranty if you exceeded the 3 year limit but I doubt they would if it wasn't exceeded by much, especially if you didn't have a problem until after the fluid was changed. But if you want to be sure then follow the schedule.
I'd find out how much you'd be saving by doing both services at once vs splitting them. There may be no savings depending on how the dealer does their book keeping.

 

No, but you know that at filter change time, you don't need to change the fluid, just the filter.
So, change fluid now, then do the filter at 7500, that will preserve your remaining warranty.

 

Ok, but they will be charging me in excess of $1,000 for this oil change and then probably another $1,000 at anther 1,500 miles for the filter change.
N0?

 

You have to ask your dealer (or shop around). Some don't give a discount for combining the services, they just add up the two book times.

 

My dealer added the cost of the oil when I had the filter changed, around $1000 total. The filter needs changed at 7500, 500 miles plus or minus. I would talked to the service mgr ans see if you can go a short time over the 3 yr mark. I would then plan a few trips adding the 1100 miles of enjoyment.

 

You are driving 2000/year and the filter can be done at 7000, so wait and do both together.

 

Do the filter change yourself, it is not that difficult, many DIY videos on youtube.
And, probably more like $500-$600 for a dealer to overcharge you for that service.
And, they would charge you that whether you had the fluid change done at the same time anyway, it is a separate service.

 

Thanks, guys. I've got it scheduled for tomorrow am. They say it will take about 3 hours. I'll take a book. - - - - A check book.

 

Confirm that the HSF (Hydraulic System Flush) will be performed.

 

If your dealer charges you for two services done at the same time I would find another dealer.

 

This may help in any charge negotiation. It's my 3 year invoice (now ~3 years old) where I had all 3 items done at just under 8000 miles to meet the 7500 +/- 500 mile requirement. You'll see the engine oil/filter was separate. I had the DCT filter changed on GM's dime year 1 at ~3000 miles. BUT there IS ZERO benefit, still have to change again at 7500 miles +/-500 to not void the DCT warranty. (BTW I self insure a number of things BUT would not risk a ~$20,000 DCT replacement. Follow GM rules.)

So subtract the $105 for the engine oil/filter and BOTH the DCT Filter and DCT fluid change. Note at the time a Flush was required BELOW the DCT Filter change. That took about 10 minutes after the Tech connected to the GM Service Computer. BUT it is more effort to do them separately as the longest time for each is removing the aluminum shear plate and loosening the one behind to get the rear plate off. Note I watched and it's my 2 1/2 to 3 hour estimate. But their labor rate was $125/hr at the time.
So doing both separately would be about 1 1/2 to 2 hrs labor each IMO.

Depending on what they quote may want to shop around as NO reason they should charge MSRP for the fluid. You'll see I got a discount. List price per liter was ~$47 at the time, they charged me $30. Typically a Dealer gets a 50% discount. And only 10 Liters were required not 11. Granted it was 3 years ago and their labor rate was $125/hour- Your Mileage My Vary!

 

$1,122.

 

If you are a Costco member you might be able to get a 15% off service coupon if the dealer is a participant in the program.

 

Yesterday, I was quoted by the Chev dealer i bought my Z06 from, $2500 to change the fluid in the trans . That included the filter. I called back and asked about price with out a filter. Still waiting for that. '

I called another dealer in Richmond and was quoted $1800 for fluid / filter AND an oil change / filter. Your price may vary.

 

I called around and got prices that were all over the place. GM needs to stop the gouging from certain dealers on the C8. One of my local dealers quoted me 750 for a dtc filter change and another 1500 for fluid. Won’t be going there.

 

It's always cheaper/better to buy the GM DCT fluid yourself, and bring it to the dealer to put in. They charge you like $60+ dollars per quart, when you can get it from Rock Auto for under $30. Then all you pay is labor. I paid like $350 for labor, then about $300 for 10 quarts of fluid, so only about $650 total instead of $900+. I found out if you bring the parts into a dealer, they don't charge tax on the labor.

 

Not all dealers will let you do this. Do you take your own steak in and have the restaurant cook it?

 

I relate that to walking into a restaurant with your own beer and telling the owner when they ask what you are doing, "You charge too much! You are telling the car dealership: "I prefer buying from a retailer who has no overhead cost of a facility to change oil or skilled mechanics."

It's not like you are buying from the manufatuer.

I prefer to bring in a reference with a lower price and asking what is the best you can do!

To Each Their Own!

 

I've heard that comparison to a restaurant before. The example I heard was bringing your own eggs to Waffle House and asking the kitchen to cook them.

So, the reason why that comparison is flawed is probably obvious, not the least of which because of health and safety risks of serving food or drink that is brought into a restaurant from outside. It's also because, well, serving food and beverage is the entire point of a restaurant's business model. Either way, it is not really applicable to cars because it's common and acceptable for folks to buy their own parts and then have a shop install them. Fluids, etc. are still parts. As long as it meets manufacturer recommendations, why wouldn't the shop just install it?

I used to bring my own oil to my Lexus dealership for my IS 500. Because Lexus was still using a synthetic blend oil in the year of our Lord 2025, I brought my own full synthetic oil. They never batted an eye at that, and in fact, my service advisor said he didn't blame me. But anyway, I usually don't do that in order to keep things simple, but this was a special case. Either way, can't hurt to ask the dealership if they are willing to use parts or fluids brought in from outside. An independent shop is more likely to participate than a dealership service department, I guess.