Automatic Transmissions...
128i's have the GM trans made in France.
135i's have ZF trans made in Germany.
Take a look at this DIY 129i AT transmission fluid change... it has the same green sticker(and fluid part number) as your car has!
DIY: 128i GM GA6L45R Automatic Transmission Filter Change
https://www.1addicts.com/forums/showthread.php?t=995991
You might check with these guys to see IF they have a AT fluid change kit for your GM trans.
The California Transmission Supply Company.
www.thectsc.com/catalog/6-speed-bmw-61.html
Dackel