06 STI Tires and Wheels - bad for snow?

[Body Roll]

We do indeed. I don't autocross myself, but several of my buddies with STIs
do and no issues with the oil in the diff. When the car is cold, it is a
bit stiff (but so is the tranny), but everything warms up in a few minutes

Right, the tranny in STI has 75W90 just like in WRX unless you swapped
it for
80W90.
IMHO 75W90 might be a bit thin if you autocross it.

 

[Body Roll]

it for
80W90.
IMHO 75W90 might be a bit thin if you autocross it.

^^^^^^^^^^^^^^^^^^
But you don't. I should pay more attention :-]