I’m doing the first oil change on my 2023 Stingray. It’s showing 15% life and coming up on one year, but mileage is about 2,300.

Since I will be under the car, I think I will also change the DCT filter.

My question is what is the correct procedure for checkin fluid level? I’m not adding the 2 extra quarts (or liters if that the container size). I read one place that said you need to get the transmission up to temperature and run it through all the gears for about a minute in each gear. Then check it at the fill plug within 5 minutes.

I can do that by jacking up the rear and going through the gears as suggested, but is that really necessary?

Thanks,
Don

 

You do not need to get it "up to temperature" - you actually need it to be between 68 degrees, which is about room temperature and below 104 degrees. And you problem will be keeping from getting too warm, or having to wait for it to cool down. Here is the procedure:

 

Exactly what I needed. Thank you!

Don

 

Andy, I was wondering and maybe I mis read this but why not: After you fill to bottom of fill plug, put plug back in then with car level run through gears (to fill circuits). Then check again level? Why not check after running through gears? Seems like you may have to add more fluid.. Did I miss something? Thanks

 

You are correct. After running in D and R for 30-40 seconds each a few times, and if the fluid is in the temp range, remove the plug and verify the fluid is just at the bottom of the threads (just streaming out is best). Add as appropriate.

 

Thanks but did I miss this in the GM how to that Andy provided? I found Andys response on another post:

..included the procedure for doing the Transmission Fluid Level and Condition Check, but interestingly, none of the other procedures actually call it out after the fluid has been added. The Transmission Fluid Fill Procedure calls it out as step 1, but that is before the fluid is drained. I would have expected it to be at the end after the fluid has been added.

So they missed it on procedure...

 

Which procedure? The level check is called from at least three different procedures. One is the filter replacement, one is the normal drain and fill, and one is the track fill procedure.

There are multiple flaws that result from the "nesting" of the procedures, when one call another, resulting in duplicate steps, missed steps, and unnecessary steps. I started to list them but its too much work.

But here is an example. The Transmission Fluid Fill Procedure step 1 call the Transmission Fluid Level and Condition Check. Then step 2 says Remove and allow transmission to drain fully. What was the point of the level check? At the end of the steps one would expect to find the a call to the level check, but in the 2020 version service manual that I have does not have that step at the end. Now, if you look at the Transmission Fluid Fill Procedure (Track Use), it includes a level check as the second step (the first step is just informational). In this case, since the intent is to add two liters to a "normal" fill, it makes sense to check the level before adding the 2 liters. And at the end there is no level check, nor should there be one.

The Transmission Fluid Level and Condition Check, when it calls for removing the fill plug, it calls out the Transmission Oil Filler or Drain Plug Replacement procedure. Unfortunately, that procedure includes steps for removing and replacing the rear cradle shear plate, removing both the fill and drain plugs. You just have to know that the intent of the call, in the context of the calling procedure, was just to remove the filler plug.

 

I need to add 2 extra because of tracking. Regardless, it’s better to slightly overfill than underfill. So if the trans is dead cold, I’d fill until it just starts to flow out and be done with it. Not sure how much the fluid expands but even with the latest case design it won’t hurt to have even a liter extra which won’t happen due to expansion. Just my .02. Or if one is sure that the fill was done right prior, measure what came out and put that amount back in.

 

When you add your new fluid, you need to cycle thru drive and reverse for 30s each for 4-5 minutes. You then add more fluid (and you will) to top it off.

 

Andy, your other post gave the answer no response was necessary ..Your previous reply:
"..included the procedure for doing the Transmission Fluid Level and Condition Check, but interestingly, none of the other procedures actually call it out after the fluid has been added. The Transmission Fluid Fill Procedure calls it out as step 1, but that is before the fluid is drained. I would have expected it to be at the end after the fluid has been added." Thanks Andy!

 

It's there (but not easy to follow), you just have to connect all the dots of the different procedures and skip the ones you've already done.

Step 13 of the attached document.

 

Thanks !!!!