3.3TT Transmission and Diff Fluid

[Tommy G]

For sure. As cheap as these kits are from Amazon, it's great to have a big assortment box handy.

I've been putting off doing the ATF flush on our '19 Stinger, which is a bit overdue in my book. But heck, it's more fun to do mods on the '23 2.5T. I did get a brand new replacement pan, so I shouldn't have to pull the drain plug on it. The check-level plug I still have to pull, but I'm not changing that o-ring, especially on a new pan.

Don't do a flush, dropping the pan is good enough since it drains 7 quarts when you do so! Just drain it and fill it.

 

[Tommy G]

yep, I needed a pipe for that damn trans fill plug.
Interesting your trans fluid change made a noticeable difference. Honestly mine made no difference at all, I wouldn't have even known it was done.
I just did it at 30k because the car was bought new so I like to do the first change at an early interval to get the break in crap out.
But that didn't look bad either. Wasn't much crap in the pan (I replaced the whole pan) and the fluid looked pretty good for break in fluid.

I did mine at 43k miles, the shifts were very noticable when the trans was cold 40F and below, but now I can't feel them it's very smooth with Amsoil! I might get a TCU retune and up the pressure!

 

[Volfy]

Don't do a flush, dropping the pan is good enough since it drains 7 quarts when you do so! Just drain it and fill it.

That's actually what I meant. I actually did some math and posted this on the G70 forums, referring to this YT vid:

BTW, I posted that YT vid because it's a really good guide for this job. However, I don't particularly agree with his plan to flush the tranny 3 times, especially with that rather expensive German Ravenol ATF. That is throwing a lot of fresh fluid away. Understand the concern that the torque converter holds about 2.2L out of the total 9.2L capacity, so I did a bit of math:

After 1st draining and refill of 7L new ATF, there will be 2.2L of old ATF mixed in.
After 2nd draining and refill of 7L new ATF, there will be (2.2/9.2) x 2.2L = 0.53L of old ATF mixed in.
After 3rd draining and refill of 7L new ATF, there will be (0.53/9.2) x 2.2L = 0.13L of old ATF mixed in.

So, 1st flush got rid of 7L of old ATF
2nd flush got rid of (2.2 - 0.53) = 1.67L of old ATF
3rd flush got rid of (0.53 - 0.13) = 0.4L of old ATF

There is definitely diminishing returns here. Personally, I have no problem with a single drain & refill, with 76% of fresh new ATF. I highly doubt the tranny will run any different than with 100% fresh ATF. I'm changing early anyway and will do so again the next time. If anything, getting rid of built-up contaminants and swapping in a brand new filter are just as important, perhaps more so.

But, if you are the OCD type, I can see doing a 2nd flush to boost the fresh ATF up to 94%. Cost would be another 7L of new ATF.

3rd flush is just plain waste of money, throwing away whole 7L of new ATF to get rid of only 0.4L of old ATF.




I did a couple of track days and numerous AutoXs on the '19 Stinger, so there were times the tranny got hotter than usual, especially in the Texas Summer heat. The 2.0T doesn't have enough power to stress out the tranny too badly, but I'd rather err on the side of caution.