Want to do a dex VI upgrade on my trans.heard nothing but good about it.Thing is i'm only doing a pan drop so i'll have all the fluid left in the converter etc. Can i mix them? I know you can't with engine oil so not sure trans fluid would be any different? ordering fluid from zzp tomorrow if i upgrade so any input would be very valuable!-Thanks!

Yes they are compatible together. When I switched to synthetic trans fluid my temps dropped 20* though that may just have been because the fluid was old.