I'm back - 2016 Chevy Cruze LT. Second drain and fill at 99895 miles. First was at 89500 on the dot.
Prior to the (first ever) change on February 23rd, 3rd gear was slipping and I experienced a pulsating shudder in multiple gears when accelerating, including inclines at highway speeds. Shortly before, one hard downshift and harsh / jerky upshifts every once in a while. Stabilitrak (ESC) warning once while accelerating hard.
After changing, the 3rd gear slipping pretty much completely went away, but there was an issue with torque converter lockup after downshifts at slow speeds around 800 miles in. That "resolved" itself, but on the instant mpg meter, it was reading ~75-88mpg coasting in that gear only versus a fuel cut (99 mpg, max read) in all other gears. Seems the car is giving very slight throttle to help it stay engaged. Whatever works, I guess.
It has gotten warmer, and in the last 1500 miles or so, that gear began slipping again with harder acceleration. The pulsating shudder when loaded at lower RPM also returned. No harsh shifts to note.
5.5 qts drained (~60% capacity) today at my buddy's house (apartment life), drove it 25 miles home. The pulsating is gone, 3rd gear did not slip. We'll see how it lasts.
The fluid was extremely dark and opaque again, smelled much more strongly than the first time around. Much less sparkly looking. The car had original fluid previously, and at this point, 80-85% has been replaced with R&P, some 10K miles old.
We are going to do one more change at 110K miles, and then it will go to 150K barring any other circumstances.
By the way, the R&P 5W-30 was visually fantastic for being in the car for 10.4K (80% highway) miles. 2 changes, 15.5K total now. It also had probably 80 hours of idle time, bad habit of lunch naps in the work parking lot. Surprisingly, or unsurprisingly, my varnished orange dipstick looked brand new today. Had a FRAM Synthetic Endurance on it, I have two more left that I snatched up before they disappeared.
I'll give another update if it's warranted prior to the next change.