This is a funny thread.
Mobil recommends 5,000 miles for Mobil Clean 5000. Unless your engine has a problem this oil can surely do 5,000mi, even in the winter (one winter, that is).
The most audacious OCI I have seen for dino is 10,000 under 'normal' conditions. (Not that I've seen them all.) If you are driving long trips in the winter it might qualify as 'normal'...
I know what a pain it is to work on the car in the freezing cold. If you choose to leave it in for 12,000 miles this winter many here would like to see a UOA.