Only problem with that is you will need to flush the transmission and empty the torque converter because you can't really mix the 2 it tends to foam. Unless U have a manual of course.
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Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716
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It will be costly to run synthetic transmission fluid, you need to have it flushed out, and I would change the filter and gasket to. The gains will be minimal, but the longevity of the transmission will benefit the car.