If you have a leaking manual transmission, check first for a blocked vent.  A
blocked vent can cause pressure to build up and create a leak past a seal.

The vent is on the first section of the transmission (where the front engine
mount is located).
It is on the top and on the drivers side of the tranny. (I have a pic to make
it clearer)
This seems to collect dirt and can block the vent.  Once blocked the pressure
builds and forces the oil out past a seal.

If yours is not leaking, I would check the vent to make sure that yours is
not blocked to avoid creating a leak.

Robert

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