After having a Peloquin diffy installed , during a clutchmasters clutch install a year ago, thanksgiving, the fluid had been changed/refilled to whatever VW utilizies from the factory.
Well, me, being me, I had to try and make it better. I had always utilized Amsoil in all my previous 4=5 speeds and differentials, so I tried it.
I tried Amsoil. Now, granted, this is in (now), November in Wisconsin, so weather (i.e. temp), is NOT the nicest.
Bottom line, Amsoil not good. In fact, it was horrible. Made shifting just nasty.
Second attempt, Valvoline trans/diff fluid. Same weight, (all are full synthetic). A little bit better then the Amsoil, but not much.
Then, I figured, I'd give the Motul a chance. WOW. Night and day. Shifting is smooth as silk. I'm like 3/4 deaf, so if it made the trans quieter, I don't know. But smoother. Hell yeah.
BTW, there was maybe 200 miles (IF), between all 3 of these trans fluid changes.

IN a year or so, (or if I pop the trans this summer, racing), I'll for sure go back to the Motul! Great stuff!