The model 3 service guide calls the drive unit fluid "ATF-9". This does not appear to be a commercially available product. The exact description of the fluid is "ATF-9. SK Lubricant 422313 (part number 1135241-00-A)" Does anyone have any idea what fluid can be used in the drivetrain, or how to obtain this fluid? Tesla service only has it by the drum, and won't help rebuilders.