M.Kraewinkel@MITUTOYO.DE writes:

<< The VW manual says due to shifting problems, the
amount of oil should be  reduced by on litre. But only for
gas-powered vans, not the diesels. I don't  know if it is right
for $ynchros. >>

That's a new one for me!  I'll bet that this was one of the
suggestions they came up with when they started noticing
the shifting problems in the 091-1 gearboxes with the non-
Moly coated syncro rings and the petroleum based gear oil.

Once we did the teardown at VW (and now here at my shop)
I replace the syncros, the crack prone 3rd/4th gear hub, and
some other modifications to other potential problem areas,
and fill it with synthetic GL4 'till it runs out the fill hole.

After I've done all that I've not had any sort of complaint about
difficulty engaging gears or other transaxle concerns.

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Todd Hill
VolksWerks Transaxles
Olympia, WA