mr. ed wrote:
The reason given why automatic transmission fluid is used is that ATF+4 fluid is more readily available to the manufacturer and less expensive. I haven't had any problems so far with this fluid and have already changed it once (using ATF+4). I believe the manufacturer knows what's right for this application but still wonder if there's any truth that a different fluid would be better/more protective, especially under high load conditions. What say you?
I say you are right. The people on those forums...were they part of the research and development for that transmission? Are they automotive engineers with extensive research using their suggested fluid in that transmission? Of course the answer is no. Use what the manufacturer recommends. After all, they are the ones who designed and built that transmission. If anyone knows they do!