Without going too OT, what is the advantage of winter tyres vs summer ones ? I have never switched for the seasons - although last year's long snow here with near slick Yokohamas was 'fun'. I don't have a spare set of wheels or space to store them, and most tyre places here won't (at least not regularly) fit / remove /replace anything they haven't sold you.
Also what about oil ? I run the VW certified stuff (505.5 ?) which seems to have a low enough temp for anything I see in winter yet I read people here also swapping that for winter. I also have American friends who change every 3 months, I go 6 as my mileage isn't high and it fits in with a summer / winter service together with MOT (safety certificate) expiring at the end of the year.
Temps and weather here don't vary normally very much - the temp range maybe goes from 20-30 Deg C in summer to -5 in winter. And, in Scotland at least, the only noticeable difference is that the drizzle and wind gets colder
