When I lived up in Glasgow, started with 5w-30 but ended up using Amsoil 0w-30.
https://www.amsoil.com/p/amsoil-signature-series-0w-30-100-synthetic-motor-oil-azo/
Good for the entire 6+ months of winter, and really helped - a lot - with cold starts. Shipped to my door, which was nice considering the lack of auto supply nearby. [insert discussion of how you could get oil at the hardware store...maybe]
https://www.amsoil.com/p/amsoil-signature-series-0w-30-100-synthetic-motor-oil-azo/
Good for the entire 6+ months of winter, and really helped - a lot - with cold starts. Shipped to my door, which was nice considering the lack of auto supply nearby. [insert discussion of how you could get oil at the hardware store...maybe]