I'm not sure this is an issue.
I had a '92 Saturn SC with the 4 spd. auto transaxle. At 30,000 miles, I drained the fluid and replaced it with Mobil1 ATF. At 40,000 miles I did it again. The car now has 200,000 miles on the odo (my Brother-In-Law's daily driver) with no transaxle service and the trans. is still stout enough to break the tires loose in first and second gears. This is a much older technology transmission that what is in the Cruze.
Remember, when you drain a transmission through the drain plug, you typically don't drain the torque converter. As a result of the two drain and refill operations, the Saturn has approximately 3/4 synthetic and 1/4 Dextron ATF in it.
Jim