Hissing from transmission

["Lino M. Valadas" <valadasl@osha.igs.net>]

Fellow Audians,

With the cold weather an anoying hiss has developed from the transmission. 
It travels through the stick.  If I move it slightly (I was going to say
'play with it' but decided against it) the hiss almost dissapears, only to
come back again when I change gears. 

I'm pretty sure its not the release bearing since I had it replaced about 6
month ago with the clutch.  The hissing does not get worse when I press the
clutch, its just there.  

I suspect its just gear noise filtering into the car.  Or is it bearings
getting noisy?  Should I try Redline gear oil, currently I have in there
whatever the Audi dealer put in there, I hope its the right oil.

Any comments?

TIA

Lino
86 5ktqw (180K km)