jhatty wrote:I think you may have hit on why Infiniti makes an M35x AWD. Rear wheel drive in winter will be bad regardless of the make / model of car. Snow tires will only help to a point, after that front wheel drive or AWD is required.
Hmmm ... with almost any brand of snow tires (most are good), a RWD car will generally be fine except for very steep hills with lots of uncleared snow. And even there, an AWD will only help a bit perceptibly better.
With icy roads, almost nothing helps, until you use metal or plastic studded tires (not allowed in some parts of the country), or tire chains. The highway climbs from the SF Bay Area to Lake Tahoe in winter is bad enough that CHP requires tire chains be used in bad weather or you are not allowed on the roads - even if you have an AWD car or snow tires.
Generalization: when temperatures are below freezing, any summer tire is downright dangerous since it will harden and act like a hockey puck and slide. Even so-called "All-Seasons" will not be as good as good snow tires, by the way, but better than summer tires.
If I lived in snow country still, I would definitely buy a set of cheap wheels and mount good snow tires on them for those conditions!
Z