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GM Part # 19317577 A.K.A. Mobil 1 LV ATF H.P. I’m not 100% sure but very close. I installed this in my 2016 Buick Enclave and it’s like a totally different vehicle in shifting and fuel economy. It’s designed to not collect moisture suspensions in the fluid.
 

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2018 Buick Enclave Premium. Took delivery in Dec 2017. Transmission had a hard shift in 5/6 when you start up (after sitting several hours/overnight). After that - no hard shifts. If you stop and let it sit for a few hours, sometimes you get a long shift or a bump again around 5/6 shift. Dealer did a programming update (don't have the bulletin number). After that - the first hard shift of the day is gone... however the hard shift after a few hours of sitting (once driven) does show up. I would think mine is probably an early production run. Also notice slight - very slight shudders around town... which is what I see from others in the forum.

Overall, fit, finish, all other items (except auto-start-stop annoyance) - the 2018 Buick Enclave is very well done. Fast, smooth, quiet.
 

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We have a 2018 Enclave Avenir, which we bought in summer of 2019 with 5 miles on the clock (got a good deal, to say the least). It just barely has 4,000 miles on it now. When it had less than 2,000 miles last fall, I took it to a Buick dealership saying I wanted the TSB for the shudder issue solution applied to prevent it from happening in the future (even though I haven't experienced it). They did the fluid change to the "correct" fluid and the programming change. I don't get the shuddering the person who started this thread has, but I don't have hardly any miles on it yet either. Yes, it shifts often in city driving, but ours is very smooth so the shifting isn't noticeable unless you pay close attention to the tach. And, unlike our prior 2009 Enclave, this one pulls a big boat without frequent shift changes, which I like a lot better than our 2009 model. Both have/had the trailering package. The 2009 pulled better with the trailering button engaged - the 2018 doesn't need to have this mode engaged to prevent frequent shifts. So from my standpoint, I think the 9-speed 2018 Enclave transmission is superior to the 2009 6-speed transmission.
 

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I sure hope GM gets its act together. GM builds some really nice looking vehicles. Hopefully these transmission issues on the new generation Enclaves are more of a fluke.
 

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Same problem with the tranny in my 2010 cxl Enclave . Dealer cant find problem but another mechanic thinks it may be an electrical problem or sensor. Keep me updated on what you find as will I.
@Don1986 and @Elm32020 I have a 2010 Enclave with 160k miles. It started staying in first several months ago. I changed about 75% of the fluid and it stopped for several months. Started again a few weeks back, so I drained 3.5 quarts and replaced it. That did not help this time. It stuck in first on the first test drive.

One workaround is to put it in L and use the manual +/- button to shift. Works every time.

I checked the drained fluid and there is no metal whatsoever in the fluid - very clean.
 
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