[Southcross]

I can tell you that the manual transmissions in the late 70s/80s and into the early 90s VWs seem to have the same problems with syncro grinds/etc (Transmission model 02O or 020). Book spec calls for 75w90 also, when I drained my gear oil it was a LOT thinner (like your description of 10w30). Many of us in the VW world have either gone the way of Redline MTL (or similar) or several like myself have gone the Syncromesh route. I run Sunoco Syncromesh in my daily, and I have Royal Purple Syncromesh to run in my race cars. We have ALL noted that the infamous syncro grinds on shifting have either disappeared all together or have greatly reduced (likely due to already permanent damage to the syncro) running Syncromesh.

My ONLY qualm about it is DO NOT buy it directly from a GM dealership.... I got raked over the perverbial coals on its cost