oil change question

[Lee M. Levitt]

Just a quick question about oil changes...I'm about to do two oil changes
(one on each car)...and have a question about viscosity. I only use Mobil
1...

On the V6, I won't be doing an oil change again until spring...on the turbo,
I'll probably be doing another oil change in February.

I'm in Boston, and my cars occasionally see temps below 0 degrees over the
course of the winter...

Should I stick with 10-30 or should I go to a 5-30 or 0-30?

Thanks!

Lee
'95.5 S6 avant
'96 A6 quattro avant