My plan once I have my C8 is to do the first engine oil and filter change at about 2,500-3,000 miles (old habit of mine). I may very well do the same with the DCT around that same time, if not at the exact same time. I have the lift and oil recovery container which makes the process very easy.

Then at or near the 7,500 mile point, I will go to Chevy for my first (and only free) oil and filter change for both the engine and the DCT. Is this when GM will perform the DCT "Flush"?

Since I don't have the C8 just yet, I don't have an owners manual to review for suggested oil brand and weight, as well as the AC Delco part number for engine and DCT filters. Can someone point me to the correct oils and filters for both the engine and the DCT.

 

Further research has indicated the following part numbers.

Engine Oil - Mobil1 SAE 0W-40 DEXOS R
DCT Fluid - AC Delco 10-4130 FFL-4

Engine oil filter - AC Delco PF64
DCT Filter - AC Delco 12706595

I've read that the engine oil capacity is 7.5 quarts, but I haven't found the DCT capacity yet.

 

11.62 Quarts or 13.73 for track fill.

 

Wow, at $27 a quart at Summit Racing, that DCT is one thirsty thing isn't it?

 

[QUOTE=rfkirk;1606980658] Since I don't have the C8 just yet, I don't have an owners manual to review for suggested oil brand and weight, [QUOTE]

You can go online and download the owner manual at any time. Good reading ahead of delivery...

 

Not thirsty at all since you don't replace the transmission fluid until 45,000 miles.

 

Your plan is completely contrary to the GM scheduled plan. If you disagree with the recommended schedule why not just throw some oil in there and be satisfied? Why would you buy this car if you don't believe the engineers?

 

I think the plan sounds perfectly reasonable. You can't over-maintain this vehicle. And I bet the recommended service schedule that ends up in the manual is a compromise between input from the engineers and marketing and sales.

 

It’s a good plan. I replaced the engine oil and dct fluid at 2450 along with filters. Was the dct fluid replacement necessary, probably not. Filter yes.

It takes about 9 liters to fill the DCT not 11+ as you can’t get it all out. I also put in the extra 2 liters for track fill (MY23). You most likely won’t need to if you have a MY24+.

The engine took 8qts to get to the top dimple on the stick. I let it drain for about 40 min as I was doing other things.

rock auto has a good price on the dct filter.
walmart, when in stock has a good price on oil. Mobil 1 supercar. 0w40

 

As long as you have the DCT external canister filter changed at 7500 miles =/- 500 miles (in accordance with the procedure in the Service Manual), regardless of any other DCT filter changes, you will be in compliance with Owners Manual. The correct name for the "Flush" to which you refer is "hydraulic system flush" and it is part of the DCT filter change procedure.

I have no comment about the earlier engine oil, filter, and DCT fitler changes. In accordance with the Owners Manaul, the fluid would be changed at 3 years, or 45000 miles, or whenever the fluid life system says to change it. You have two years to claim the free service, regardless of miles.

 

Oh I believe the engineers, but its not their car its mine. In over fifty years of driving and owning nearly 50 cars, including several higher performance cars than the C8 I have never found over maintaining a car to be a problem. In fact, when I've brought in my last several cars for their "free oil changes" well ahead of what "the engineers" thought I was told by both the service advisor and the mechanic that they wished more people took such good care of their engines. If you ever listen to Rick Conti on YouTube on his Tech Tuesday videos, the lead tech at his dealership wholeheartedly agrees with over maintaining the C8.

[QUOTE=Bob Paris;1606980959][QUOTE=rfkirk;1606980658] Since I don't have the C8 just yet, I don't have an owners manual to review for suggested oil brand and weight, I did go ahead and download the MY 24 Owners Manual, thanks for the suggestion.

 

In my youth, my garage was fully prepared. Filter wrench, radiator flush kit, funnels, real red shop rags, Zerex. Havoline 20/20, drain pan, and an oil can piercer spout combo, Showing my age, Boraxo Hand Cleaner. Hanging on the wall were short ramps and a creeper. Even a timing light. Today? My garage is equipped with Apple Maps so I can find the dealer's service drive.

 

Thats funny. I wish I could find Boraxo, it did a great job of cleaning your hands with its grit. In my case, its just the reverse. Now I have a fully stocked shop with a lift, oil extraction tank, tools, etc.

 

Did you also "trust the science?"

 

almost every video I’ve seen takes 8quarts. But fill accordingly

 

If you'll have 7500 miles before end year 2 that may work BUT GM says perform a FLUSH prior to all DCT filter changes. I had my first DCT filer changed at ~3000 miles as that is when my engine oil required changing as in was 12 months from when I got the car. Engine oil is changed as it was for my C7 when the OLM says, which it says in the C8 Owner's Manual (look at the forum 'Sticky Threads as you can download a PDF. Heck of a lot better you can search! Don't think I have opened my paper manual but a few times for my C7's or C8.) Engine oil change requirements are based on the OLM NOT miles. Been that way for my C6, two C7s and now C8. Frankly back in the day when all we had was miles and time miles were a poor indicator. Where they good highway miles with few starts and stops OR poor City miles with many starts, and worse cold starts. Good example was my 1993 Vette where the owner's Manual said IF MOST DRIVES were less than 4 miles change oil every 3000 miles OR 3 months whichever occurs 1st. See Pic.

I looked at the Dealer Tech GM Servcie Computer when he did my flush. It said the flush is designed to take any debris and put it in the the filter housing and filer BEFORE it is changed. It's a procedure done by the GM Service Computer removes no DCT fluid other than the ~8 oz that are in the filer and housing when the new one is inserted.)

Just had my DCT filter changed again year 3 with a flush done before.


Just Sayn!

 

Your plan seems well thought out. An added maintenance while also following the required scheduled maintenances.



​

 

I agree the OP's plan is mostly sound. I changed my oil at 3.5k miles myself (super easy BTW).

But this post brings up a good point about the DCT flush. AFAIK, the dealer is the only one with that ability to flush the DCT. I don't know if simply changing the filter and refilling will be as beneficial if there is no flush. Not sure if it's known at all. Will it hurt? Nope. But I would assume the flush is done for a reason...

 

Yep, been changing all my own oil for 63 years. Changed all my own in 5 prior Vettes up to the C8. Even the GM 4 FREE for my two C7s was not worth the risk of having it done wrong!

I fortunately found a great C8 Tech who changes oil the way did! First uses my 4 jack pads to lift on his center post with arms lift. With the C8 he underfills based on an estimate of volume in a table (an estimate is all it is) and gets the oil to 175F. Then checks the level and fills just below NOT above the MAX level on the dip stick. It says MAX for a reason.

Also a couple of reasons I took advantage of the GM Free DCT filter and engine oil year one when the OLM said change engine oil with ~3000 miles:

• Knew I would not have 7500 miles in year 2. This is my 6th Vette, all DD's BUT been retired now 23 years and don't have to drive every day. Only use the Vette locally.
• There were a number of posts where folks reported DCT CELs with few miles. The dealer was told by GM Service after discussing the codes to perform a FLUSH, no filter change or fluid change JUST a FLUSH. Most times the CEL was gone.
• When crawling into my garage to keep the driver's door mirror tip at ~1" max from the wood door molding (to assure the passenger mirror tip clears) for the 1st ~1000 miles it was a bit jerky. After that, as now it was very smooth.
• Knew that 1st gear clutch was slipping at the 2 to 3 mph speed I was driving. Had to or the engine would stall. The initial wear of the high spots on the multiplate clutch after ~1000 miles made it smooth. That wear and other initial, synchromesh cones (three per gear), and gear wear is usually highest that first 1000 miles and certainly by 3000 the majority was in the filter.
• Also read the Owner's Manual and KNEW year 3 all DCT fluid required changing (even with low miles.)
• Understood GM says if changing the DCT filter early (as I did) MUST also change again at 7500 miles. By year 3 would have that many miles. So my plan was to have the DCT filter changed again year 3, with the fluid change, which I just had done with a FLUSH as GM requires.

Pic of my 1st year FLUSH before the DCT filter was changed. It's all done by the GM Service Computer connected to your car via OBD port. Watched a few weeks ago and it was the same. GM service computer sets the rpm to ~2000. It said testing and after 10 minutes stated flush completed. Took ~10 minutes,

 

That"s right. There are some procedures that call for the hydraulic system flush to performed and the filter is not necessarily changed after the flush. In fact, the latest procedure for the DCT filter change (see post 10) actually says that if the mileage is beyond the interval where the filter should have been changed, then the filter should be changed first, followed by the hydraulic system flush - to avoid exceeding the capacity of the filter when the hydraulic system flush is performed.