On page 35.60 of Bentley, its says the capacity is 3.2 quarts or 9/16"
below the filler hole.

I bent a coat hanger wire in an "L" shape and put it in the filler hole.
Then it's easy to measure to the fluid sticking to the wire.  You might
want to bend a ring in the other end larger than the filler hole to prevent
dropping it into the transmission.

On Mon, Aug 29, 2016 at 4:48 PM, Steve Williams <
steve@williamsitconsulting.com> wrote:

> Hi,
>
> I know I read an article on the Internet within the last 2 weeks that
> stated the filling policy had changed... Of course, I can't find it now.
>
> I believe that the original irections were to fill to the level of the
> filler hole.
>
> I seem to remember reading that VW found this was causing too much
> aeration and the new recommendation was some depth below the filler hole.
>
> How far below the filler hole should the oil level be on a 4 speed
> manual transaxle on a 1991 Westfalia?
>
> Does anyone know exactly how much fluid the corresponds to?  It would be
> nice to not get it "too full".
>
> Thanks,
> Steve Williams
>