So back earlier this year I read a bunch of posts about all the dire consequences of using Syn 3 in the transmission.
I have used Syn 3 for all fluids now for about a year, and I just did a fall oil change with about 7500 kms (4700 miles) on the fluids since last change.
I am here to report that when I drained the trans fluid, it had to be the clearest oil I have ever drained out of anything. Moreover there was not a trace of any metal particles of any sort on the magnetic plug. Also I have not noticed the trans making any more noise than it used to with dino oil. My pipes are medium noisy.
Bike is an '04 classic BTW with 44,000 kms on it.