May I ask why?

Also in the winter should I change to a 10w30?
instead of the 5w30 I currently have and just changed?
I drove in the deepness that was the heavy powder of the last bad winter in an old MX3, new tyres etc not a problem, slid about a bit and speed bumps in the centre of Brumland were a problem but nothing a run up could not solve. TBH I am very excited to see the winter, being a strawberry blonde I have this issue with the strong sunshine:

What should I expect from my Lude? Should I store it? Any Prep I should do if I want to take her out in the winter?
Currently she screeches whenever it rains, when its dry and sunny quiet as a mouse......