I have a 2018LT 1.5 turbo with just shy of 80,000 miles. Original tranny fluid. The maintenance section in the manual only recommends changing the fluid in the 1.8L hybrid and that's at 240,000 miles. My last malibu was a 2006LT with a 2.2L that stated under normal driving conditions you do not need to change the tranny fluid. The 2006 went 244,000 miles on the original tranny fluid. Never had a single problem with the tranny in that car. Only retired it because the body was rotting out around the power train. The 2018 manual doesn't specifically state you do not need to change the tranny fluid like the 2006 manual did. A friend has a 2017LT and that manual recommends every 45,000 miles for a tranny fluid change. Are there 2 different transmissions from 2017 to 2018. I would trust the no change fluid based off of my last malibu. Just curious as to why the manual only mentions the 1.8L hybrid change. Absolutely no tranny problems what so ever to date. Car is rock solid!