What fluid to use in rear diff?

[Brett Dikeman]

On Feb 16, 2006, at 10:46 AM, patrick.anderson1 at comcast.net wrote:

> What is the consensus on the proper fluid to use in the rear diff?  
> Using redline MT90 for the tranny and I think it is OK for the rear  
> diff as well since it is an open diff. Thanks.

The weight for the rear diff oil is different from the main  
transmission, I think.  Regardless- there's no reason not to use the  
VW/Audi synthetic fluids.  I've found it gets a little hard to shift  
in -25 degree F weather, but the seats also turn rock-hard, the  
displays take seconds to 'update' and the exhaust pipe nearly seals  
itself up :-)

Brett