Then summers with all seasons is your answer. Just fly when it's really snowy or cold!

Can't fly, I need my car when I go.

I think I'm now pretty set on all-seasons and summers.

Thanks for everyones help. I'll be sure to post up pictures when I actually have a C63 in my possession, haha.

Do you really think you can make Rogers Pass or Golden with all seasons in a C63 when there's snow? I wouldn't even try that drive without good winters in the spring! Not a whole lot separating the road from a massive cliff!

Should've added that it's always early April when I make the trek.

Can't speak to making that drive in the winter (I wouldn't in the C) but I did it a couple weeks ago on summers and get to do it again tomorrow. Been looking forward to it all week. That kind of drive feels like what the C63 is made for. Lots of power lets you make the most of passing opportunities plus space for the family and a nice cush ride when stuck in traffic. Great 4 door GT car!