In trannies that work like they're supposed to I use Honda Genuine MTF. I have tried GM Syncromesh in the past on trannies that had a slight grind and it did seem to eliminate it. I haven't tried the Royal Purple Syncromax yet but I did talk to the Royal Purple rep about it at SEMA and he was very confident that it would outperform GM Syncromesh as that was their design target when they developed it. This is not the regular Royal Purple MTF it's called Syncromax.
That said there is no reason to run anything other than Honda Genuine MTF really.
That said there is no reason to run anything other than Honda Genuine MTF really.
